[2] Selected Publication, Additional Publication, Books, Scientific Works, Conference Posters, Lectures

1. Petko I. Bozova,, Plamen N. Penchev; Neo-clerodane diterpenoids from Teucrium polium subsp. vincentinum (rouy) D. Wood. Phytochemistry Letters, 31, 237-241 (2019).[full text]
2. S. H. Tsoneva, S. R. Nachkova, G.N.Andreev, P. N. Penchev; Identification of mixture components by multiple linear regression and substraction of reference spectra: searching infrared and raman libraries. Bulgarian Chemical Communications, 49(Special Issue D), 19-24 (2017).[full text]
3. P. N. Penchev, S. H. Tsoneva, S. R. Nachkova; Spectral similarity versus structural similarity: Raman spectra. Bulgarian Chemical Communications, 49 (Special issue G), 61-64 (2017). [full text]
4. Plamen N. Penchev, Josep Coll, Katia Nicolova, Ilia N. Iliev and Petko I. Bozov; Minor diterpenoids from Scutellaria galericulata. Phytochemistry Letters, 15, 103-107 (2016).[full text]
5. S. R. Nachkova, S. Milenkova, P. Penchev, P. Bozov; Interpretive library search of plant compound spectra in a ¹³C NMR database. Chemistry of Natural Compounds, 51 (5), 993-996 (2015).[full text]
6. Plamen N. Penchev, Stefka R. Nachkova, Tonka A. Vasileva and Petko I. Bozov; ¹H and ¹³C NMR analysis of neo-Clerodane Diterpenoid Scutecyprin. Natural Product Communications, 9 (8), 1065-1068 (2014). [full text]
7. Petko I. Bozov, Plamen N. Penchev and Josep Coll; neo-Clerodane Diterpenoids from Scutellaria galericulata. Natural Product Communications. 9 (3), 347-350 (2014). [full text]
8. Petko I. Bozov, Plamen N. Penchev, Tonka A. Vasileva and Ilia N. Iliev; Diterpenoids from Scutellaria galericulata. Chemistry of Natural Compounds, 50 3, 479-480 (2014). [full text]
9. Petja Marinova, Marin Marinov, Maria Kazakova, Yana Feodorova, Plamen Penchev, Victoria Sarafian and Neyko Stoyanov; Synthesis and in vitro activity of platinum(II) complexes of two fluorenylspirohydantoins against a human tumour cell line. Biotechnology & Biotechnological Equipment, 28, (2), 316-321 (2014).[full text]
10. Petja Marinova, Marin Marinov, Yana Feodorova, Maria Kazakova, Danail Georgiev, Vanya Lekova, Plamen Penchev, Neyko Stoyanov; Synthesis, cytotoxicity and antibacterial activity of 3-amino-9'-luorenespiro-5-hydantoin. Comptes rendus de l'Academie bulgare des Sciences. 67 (4), 513-518 (2014). [full text]
11. S. Sotirov, M. Todorova, M. Draganov, P. Penchev, R. Bakalska, V. Serbezov; Investigation of new Stilbazolium dye thin films deposited by Pulsed Laser Deposition. Proc. of SPIE, Vol. 8770, 87700E (2013). [full text]
12. Plamen N. Penchev, Klaus-Peter Schulz, and Morton E. Munk; INFERCNMR: A ¹³C NMR Interpretive Library Search System. Journal of Chemical Information and Modeling, 52, 1513-1528 (2012).  [full text] [Times Cited: 1]
13. H. El Ouazzani, Sylvie Dabos-Seignon, D. Gindre, K. Iliopoulos, M. Todorova, R. Bakalska,  P. Penchev, S. Sotirov, Ts. Kolev, V. Serbezov, A. Arbaoui, M. Bakasse, and B. Sahraoui; Novel Styrylquinolinium Dye Thin Films Deposited by Pulsed Laser Deposition for Nonlinear Optical Applications. The Journal of Physical Chemistry C. 116 (12), 7144-7152  (2012) [full text]  [Times Cited: 3]
14. Plamen N. Penchev, Neyko M. Stoyanov, Marin N. Marinov; A complete ¹H and ¹³C NMR data assignment for 3-phenylmethylene-1H,3H-naphtho-[1,8-c,d]-pyran-1-one. Spectrochimica Acta Part A, 78, 559–565 (2011). [full text] [Times Cited: 1]
15. Milen Georgiev, Vasil Georgiev, Plamen Penchev, Daniela Antonova, Atanas Pavlov, Mladenka Ilieva and Simeon Popov; Volatile metabolic profiles of cell suspension cultures of Lavandula vera, Nicotiana tabacum and Helianthus annuus, cultivated under different regimes. Engineering in Life Sciences, 10 (2), 148–157 (2010). [full text] [Times Cited: 4]
16. P.N. Penchev, G.N. Andreev, K. Varmuza; Computer-assisted structure elucidation of organic compounds by infrared spectroscopy. Asian Chemistry Letters, 13 (3&4), 195-200 (2009). [full text] [Times Cited: 0]
17. P.N. Penchev, V.L. Miteva, A.N. Sohou, N.T. Kochev, G.N. Andreev; Implementation and Testing of Routine Procedure for Mixture Analysis by Search in Infrared Spectral Library; Bulgarian Chemical Communications, 40 (4), 556-560 (2008). [full text] [Times Cited: 3]
18. Steven S. Wesolowski, Matthew L. Leininger, Plamen N. Pentchev, and Henry F. Schaefer III ; Electron Affinities of the DNA and RNA Bases. Journal of the American Chemical Society, 123 (17), 4023-4028 (2001). [full text] [summary] [Times Cited: 135]
19. Kurt Varmuza, Nikolay T. Kochev and Plamen N. Penchev; Evaluation of Hitlists from IR Library Searches by the Concept of Maximum Common Substructures. Analytical Sciences,17, i659-i662 (2001). [full text] [summary] [Times Cited: 1]
20. Plamen N. Penchev, Kurt Varmuza; Characteristic substructures in sets of organic compounds with similar infrared spectra. Computers & Chemistry, 25 231–237  (2001). [full text] [summary] [Times Cited: 1]
21. P.N. Penchev, G.N. Andreev, K. Varmuza; Automatic Classification of Infrared Spectra Using a Set of Improved Expert-based Features. Analytica Chimica Acta, 388(1-2), 145-159 (1999). [full text] [summary] [Times Cited: 13]
22. K. Varmuza, P. Penchev, H. Scsibrany. Maximum Common Substructures of Organic compounds Exhibiting Similar Infrared Spectra. Journal of Chemical Information and Computer Sciences, 38, 420-427 (1998). [full text] [summary] [Times Cited: 17]
23. K. Varmuza, P. Penchev, F. Stancl, W. Werther; Systematic Structure Elucidation of Organic Compounds by Mass Spectra Classification. Journal of  Molecular Structure, 408/409, 91-96 (1997). [full text] [summary] [Times Cited: 2]
24. K. Varmuza, P.N. Penchev, H. Scsibrany; Large and Frequently Occurring Substructures in Organic Compounds Obtained by Library Search of Infrared Spectra. Vibrational Spectroscopy, 19, 407-412 (1999). [full text] [summary] [Times Cited: 5]
25. G.N. Andreev, B.A. Stamboliyska, P.N. Penchev; Vibrational Spectra and Structure of 1,4-Dinitrobenzene and its ¹⁵N Labelled Derivatives: Experimental and Ab Initio Force Field Treatments. Spectrochimica Acta, Part A, 53, 811-818 (1997). [full text] [summary] [Times Cited: 7]
26. Plamen N. Penchev, Nikolay T. Kotchev, George N. Andreev; Infrared spectra interpretation by means of computer.Traveaux Scientifiques d’Universite de Plovdiv, 29 (5), 21-26 (2000). [full text] [Times Cited: 2]
27. D. Hristozov, P. Penchev, G. Andreev; Searching in UV/Vis Spectral Library. Traveaux Scientifiques d’Universite de Plovdiv, 30 (5), 63-66 (2001). [full text] [Times Cited: 2]
28. N. Kochev, P. Penchev, G. Andreev, K. Varmuza; Improved Realisation of Maximum Common Substructure Concept for Structure Elucidation. Traveaux Scientifiques d’Universite de Plovdiv, 30 (5), 73-78(2001). [full text] [Times Cited: 0]
29. P.N. Penchev, N.T. Kochev and G.N. Andreev; IRSS: A Programme System for Infrared Library Search. Comptes Rendus de l’Academie Bulgare des Sciences, 51(1-2), 67-70 (1998). [full text] [Times Cited: 1]
30. P.N. Penchev, A.N. Sohou and G.N. Andreev; Description and Performance Analyses of An Infrared Library Search System. Spectroscopy Letters, 29, 1513-1522 (1996). [full text] [summary] [Times Cited: 4]
31. P.N. Penchev, O.K. Argirov and G.N. Andreev; Mass Spectra Classification According to Substructures and Molecular Formula Using Artificial Neural Networks. Analytical Laboratory, 3, 29-33 (1994). [summary] [Times Cited: 1]
32. G.N. Andreev, O. K. Argirov and P.N. Penchev; Expert System for Interpretation of Infrared Spectra. Analytica Chimica Acta, 284, 131-136 (1993). [full text] [summary] [Times Cited: 14]

1. Tsoneva, S. Nachkova, P. Penchev; Joint Spectral Database of Infrared and Raman Spectra. Scientific Works: University of Ruse “Angel Kanchev”, 52, Issue 10.1, 47-51 (2015). [full text]
2.  Marin Marinov, Iliana Nikolova, Petja Marinova, Neyko Stoyanov, Plamen Penchev, Krasimir Ivanov; Synthesis of 4- and 5- nitro-substituted heteroaryl cinnamoyl derivatives. Scientific Works: University of Ruse “Angel Kanchev”, 54, Issue 10.1, 17-21 (2015). [full text]
3. Marin Marinov, Iliana Kostova, Emilia Naydenova, Rumyana Prodanova, Petja Marinova, Plamen Penchev, Neyko Stoyanov; Synthesis and antimicrobial activity of new 3-substituted cyclohexanespiro-5-hydantoin derivatives. Scientific Works: University of Ruse “Angel Kanchev”, 54, Issue 10.2, 62-67 (2015). [full text]
4. P. Penchev, S. Tsoneva, Ts. Krusteva and S. Nachkova, Spectral Libraries of Viabrational Spectra. Scientific Researches of the Union of Scientist in Bulgaria – Plovdiv, SeriesB. Natural Sciences and the Humanities.16, 79-84 (2014) [full text]
5. S. Nachkova, S. Milenkova, P. Bozov, P. Penchev; Interpretive search in a ¹³C-NMR spectral library of plant compounds. Scientific Works: University of Ruse "Angel Kanchev".  52, (10.1), 47-51 (2013).[full text]
6. S. Tsoneva, S. Nachkova, P. Penchev; ATR spectra database of organic compounds. Scientific Works: University of Ruse "Angel Kanchev". 2013, 52, Issue 10.1, 38-40.[full text]
7. Petja Marinova, Marin Marinov, Yana Feodorova, Maria Kazakova, Danail Georgiev, Elena Trendafilova, Plamen Penchev, Victoria Sarafian, Neyko Stoyanov; Synthesis, antimicrobial and in vitro antiproliferative activity of 4’-bromo-(9'fluorene)-spiro-5-(2,4-dithiohyda ntoin) agains tumor cells. Scientific Works: University of Ruse "Angel Kanchev". 2013, 52, Issue 10.1, 33-37.[full text]
8. Marin Marinov, Petja Marinova, Plamen Penchev, Neyko Stoyanov; Synthesis of (4',5'-diaza-9'-fluorene)-spiro-5-hydantoin. Scientific Works: University of Ruse "Angel Kanchev". 2013, 52, Issue 10.1, 21-24. [full text]
9. Marin Marinov, Petja Marinova, Plamen Penchev, Elena Trendafilova, Neyko Stoyanov; Alkaline hydrolysis of cyclopentanespiro-5-(2,4-dithiohydantoin). Scientific Works: University of Ruse "Angel Kanchev". 2012, 51, Issue 9.1, 26-29. [full text]
10. Marin Marinov, Donyo Ganchev, Petja Marinova, Stefan Krustev, Plamen Penchev, Milena Zlateva, Nadezhda Atanasova, Neyko Stoyanov. Acute toxicity of some spirohydantoins and their derivatives towards Planorbis planorbis (Ram's Horn Snail). Scientific Works: University of Ruse "Angel Kanchev". 2012, 51, Issue 9.2, 18-21. [full text]
11. Marin Marinov, Donyo Ganchev, Petja Marinova, Plamen Penchev, Stefan Krustev, Milena Zlateva, Nadezhda Atanasova, Neyko Stoyanov; Ecotoxicological Examination of Acute Toxicity of Some Spirohydantoins and their Derivatives towards Sea Lettuce (Ulva Lactuca). Journal Scientific and Applied Research. 2012, 2, 74-81. [full text]
12. Petja Marinova, Marin Marinov, Neyko Stoyanov, Plamen Penchev; New Metal Complexes of Cyclohexanespiro-5-hydantoin. University of Plovdiv "Paisii Hilendarski", Scientific Studies, 2012, Vol 2, 195-203.
13. P. Penchev, N. Kochev, V. Vandeva, G. Andreev; Prediction Of Boiling Points Of Acyclic Aliphatic Alcohols From Their Structure; Traveaux Scientifiques d'Universite de Plovdiv, 35 (5), 53-57 (2007). [full text] [Times Cited: 0]
14. P. Penchev, R. Bakalska, S. Sotirov, M. Todorova, V. Serbezov; Comparative Spectroscopic Analysis of Thin Films and Targets from NLO Materials Deposited by Pulsed Laser Deposition. UNIVERSITY OF PLOVDIV "PAISII HILENDARSKI", SCIENTIFIC STUDIES - CHEMISTRY, VOL. 37 (5), 59-64 (2010). [full text] [Times Cited: 0]
15. P.N. Penchev and J.S. Petrov; Vibration Spectra of 2-[(Trichloroacetyl) Amino]Benzamide and a Partial Assignment of the Vibrational Bands. UNIVERSITY OF PLOVDIV "PAISII HILENDARSKI", SCIENTIFIC STUDIES - CHEMISTRY, VOL. 37 (5), 55-58  (2010). [full text] [Times Cited: 0]
16. Nikolay T.  Kochev, Plamen N. Penchev, Atanas T. Terziyski, George N. Andreev; Software Approaches for Structure Information Acquisition and Training of Chemistry Students. International Journal on Information Theories & Applications, 8(4), 199-206 (2001). [full text] [Times Cited: 0]

Books
1. L.P. Futekov, P.N. Penchev; Theory of the Experiments, Plovdiv University Press, Plovdiv, (1992, 1998) in Bulgarian, pp. 156. Summary: This student textbook deals with the applications of statistical methods in chemistry. Contents: Random Variables; Hypothesis Testing; Errors in the Chemical Experiments; Signal and Noise; Correlation and Regression; Application of Calibration in Chemistry; Modelling and Optimization of the Chemical Experiments.  [Times Cited: 2]

• P.N. Penchev; M.Sc. Thesis:"Interpretation of electronic spectra of Bi(I) in molten salt media with Angular Overlap Model", Plovdiv University, Plovdiv, 1989 (in Bulgarian). Summary: The electronic spectra of Bi(I) compounds in molten salt media have been investigated with the aid of Angular Overlap Model (AOM). Three possible structures of BiX₃^2-  (X = Cl, Br) complexes -- planar (with the symmetry D_3h) and two pyramidal (C_2v, C_3v) ones, were tested. The planar structures gave the best fit between the experimental spectra and those calculated with AOM spectra.

• P.N. Penchev; Ph.D. Thesis: "Application of chemometric methods for identification of organic compounds from their infrared spectra.", Plovdiv, Bulgaria, 1998 (in Bulgarian). Summary:The purpose of the present dissertation is to design a complex program system for identification of organic compounds from their infrared spectra. In the dissertation (1) are formulated the main limitations of infrared spectra interpretation; (2) is described the program implementation of 7 library search routines which were tested for an identification search; (3) is developed a regression method for analysis of infrared spectra of organic compounds' mixtures; (4) is applied a method for analysis of hit-list compound structures using the concepts of maximum common substructure; (5) the model of artificial neural networks is explored and compared with linear discriminant analysis. The explored and developed methods are implemented in a complex program system for infrared spectra interpretation. The system works under Windows environment.
• P.N. Penchev; Dr. Sc. Thesis: "Computer interpretation of molecular spectra for structure elucidation of organic compounds". Plovdiv, Bulgaria, 2016 (in Bulgarian). Summary: The main topic and aim of the dissertation is the development, programming, application and implementation of various mathematical methods for interpretation of UV/Vis, IR, Raman, 13C NMR and mass spectra of organic compounds. As a result of the work on the dissertation several spectral libraries were created of hundreds of UV/Vis, IR, ATR, Raman and ¹³C-NMR spectra of organic compounds measured in our laboratory. Several spectral libraries of spectra measured in other institutions were also created. Seven algorithms for library search of IR and Raman spectra were programed and tested. A method for qualitative analysis of IR and Raman mixture spectra is developed. Two methods–a k-nearest neighbors and maximum common substructure–were developed and applied to structurally evaluate library search results. A method for interpretive library search in a database of assigned 13C NMR spectra is proposed and programed, and it is thoroughly tested for interpretation of natural compounds’ spectra. The relation between spectral and structural similarity is studied for IR and Raman spectra. The ¹H and ¹³C spectra of six organic compounds are fully assigned.
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Conference Posters Presentations (2011 - 2018)

1. P. Marinova, M. Frenkeva, M. Marinov, N. Soyanov, P. Penchev; Full assignment of ¹H and ¹³C NMR spectra of 4'-brome- spiro-(fluorene-9,4'-imidazolidine)-2',5'-dione. Семинар на фирма АСМ2, Пловдивски Университет „Паисий Хилендарски”, Thermo Fisher Scientific и Milestone Srl. на тема: Околна среда, медицина, наноматериали – иновативни методи за пробоподготовка и анализ. 29.05.2018.
2. M. Frenkeva, P. Marinova, M. Marinov, N. Soyanov, P. Penchev; Full assignment of ¹H and ¹³C NMR spectra of bis-(1?,3?-hydroxymethyl)-spiro-(fluorene-9,4?-imidazolidine)-2?,5?-dione. Семинар на фирма АСМ2, Пловдивски Университет „Паисий Хилендарски”, Thermo Fisher Scientific и Milestone Srl. на тема: Околна среда, медицина, наноматериали – иновативни методи за пробоподготовка и анализ. 29.05.2018.
3. P. Marinova, M. Frenkeva, S. Tsoneva, P. Dzhambazova, P. Penchev; New palladium(II), copper(II), cobalt(II) and

Gold(III) complexes of 2-thiouracil. Poster# S2P5, Chemical Faculty 11th Chemistry Conference, University of Plovdiv, 11 - 13 October, 2018, Plovdiv, Bulgaria.
4. H. El Ouazzani, K. Iliopoulos, R. Bakalska, P. Penchev, S. Sotirov, Ts. Kolev, V. Serbezov, M. Bakasse, Sylvie Dabos-Seignon and B. Sahraoui; Diagnostic and characterisation of selected styrylquinolinium dye thin films deposited by pulsed laser deposition for nonlinear optics. International Workshop on Nano and Bio-Photonics (IWNBP), St Germain au Mont d’Or, France, 23-28 October 2011.
5. S. Nachkova, S. Milenkova, P. Bozov, P. Penchev; A ¹³C NMR Interpretive Library Search System. International Conference of Young Scientists – PLOVDIV'2013, 13-16 юни 2013 г. (конференция с международно участие).
6. P. Penchev, S. Tsoneva, Ts. Krusteva, S. Nachkova; Spectral Libraries of Vibrational Spectra. Научна сесия „Дни на науката 2013” на СУБ, гр. Пловдив, 30 - 31 окт. 2013 г.
7. S. Nachkova, S. Milenkova, P. Bozov, P. Penchev; Interpretive Search in a 13C-NMR Spectral Library of Compounds Isolated from Plants. Научна конференция РУ & ДНТ & СУ’ 2013, гр. Разград, Ваканционен СПА комплекс “Островче”, 01-02.11.2013 г. (конференция с международно участие).
8. S. Tsoneva, S. Nachkova and P. Penchev; ATR Spectra Database of Organic Compounds. Научна конференция РУ & ДНТ & СУ’ 2013, гр. Разград, Ваканционен СПА комплекс “Островче”, 01-02.11.2013 г. (конференция с международно участие).
9. Стефка Начкова, Слава Цонева, Пламен Пенчев; Потребителски спектрални библиотеки. Семинар с международно участие на ПУ ”П.Хилендарски”, АСМ2 & Thermo Scientific, на тема: “Съвременни методи за анализ и контрол на храни и околна среда”, гр.Пловдив, 21 май 2014 г., гр. Пловдив.
10. Слава Цонева, П. Пенчев, С. Начкова; Търсене по подобие в Раман спектрални библиотеки. Конференция на Русенския  университет, Разград, 29-30 октомври, 2014 г.

 

1. V. Kmetov, V. Stefanova, P. Penchev, L. Futekov, J. Tyson. Flow  Injection  Sample  Introduction  in  ICP-MS. PERKIN ELMER Seminar, Varna (Bulgaria), March 1994, 22-23.
2. G.N. Andreev, P.N. Penchev, B.A. Stamboliyska, I.N. Juchnovski; Vibrational Spectra and Structure, Normal Coordinate Analyses and Ab Initio Calculations of 1,4-Dinitrobenzene and its ¹⁵N Labelled Derivatives. XXIX Colloquium Spectroscopicum Internationale, Leipzig (Germany), August 27 - September 1, 1995, Th-G 101.
3. P.N. Penchev, A.N. Sohou, G.N. Andreev. Interpretation of Reduced Infrared Spectra with the Aid of Artificial Neural Networks. Second National Conference of Chemistry, Plovdiv (Bulgaria), April 12-14  1995, R VI/32.
4. P.N. Penchev, A.N. Sohou, G.N. Andreev. User-made Infrared Spectra Library Search System. Second National Conference of Chemistry, Plovdiv (Bulgaria) 12-14 April 1995, R VI/33.
5. K. Varmuza, P.N. Penchev, H. Scsibrany. Maximum Common Substructures of Organic Compounds Exhibiting Similar Infrared Spectra. 12th CIC Workshop, Mannedorf 1997.
6. K. Varmuza, P.N. Penchev, H. Scsibrany. Large and Frequently Occurring Substructures in Organic Compounds Obtained by Library Search of Infrared Spectra. 3rd International Symposium on Advanced Infrared and Raman Spectroscopy, Vienna (Austria) July 5-9, 1998.
7. K. Varmuza, H. Scsibrany, P.N. Penchev, F. Ehrentreich. Maximum Common Substructures of Organic Compounds Exhibiting Similar Infrared Spectra or Mass Spectra. 5th International Conference on Chemical Structures, Noordwijkerhout, The Netherlands, June 6-10 1999.
8. P.N. Penchev, N.T. Kotchev, A. N. Sohou, G. N. Andreev. Identification of Organic Compounds and Mixtures through a Search in Infrared Spectral Databases. Scientific Conference 75 Aniversary of Analytical Chemistry Departament, Chemical Faculty at Sofia University, Sofia (Bulgaria) May, 1999.
9. P.N. Penchev, N.T. Kotchev. Program System for Identification of Chemical Compounds on the Basis of Spectral Information. 24th International Conference "Information and Communication Technologies and Programing' 99", Plovdiv (Bulgaria), June 1999.
10. P.N. Penchev, N.T. Kotchev, G. N. Andreev. Computer-assisted Structure Elucidation of Organic Compounds by Infrared Spectroscopy. Ninth International Workshop on Quantitative Structure Activity Relationships in Environmental Sciences (QSAR2000). Bourgas, Bulgaria, September 16 - 20, 2000.
11. P.N. Penchev, N.T. Kotchev, G. N. Andreev. k-Nearest Neighbour Classification of Infrared Spectra. Ninth International Workshop on Quantitative Structure Activity Relationships in Environmental Sciences (QSAR2000). Bourgas, Bulgaria, September 16 - 20, 2000.
12. Plamen N. Penchev, Nickolay Kochev, Vicktoria Vandeva, George Andreev; Prediction of Boiling Point of Alicyclic Aliphatic Alcohols from their Structure. 6th Chemistry Conference of Chemical Faculty of University of Plovdiv, 20-22  June  2007, Plovdiv, BULGARIA (конференция с международно участие).
13. P.N. Penchev, R. Bakalska, S. Sotirov, V. Serbezov; Comparative Spectroscopic Analysis of Thin Films and Targets from NLO Materials Deposited By PLD. 8th Chemistry Conference of Chemical Faculty of University of Plovdiv,, Koprivshtitsa, 18-19 June 2010.
14. P.N. Penchev, S. Sotirov, E. Penchev, V. Serbezov, F. Herbst; Spectroscopic and Optical Analysis of DLC/Polymer Nanocomposites Thin Films. 8th Chemistry Conference of Chemical Faculty of University of Plovdiv,, Koprivshtitsa, 18-19 June 2010.
15. P.N. Penchev, J.S. Petrov; Vibrational Spectra of 2-[(Trichloroacetyl)Amino]Benzamide and a Partial Assignment of the Vibrational Bands. 8th Chemistry Conference of Chemical Faculty of University of Plovdiv,, Koprivshtitsa, 18-19 June 2010.
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Lectures

1. P. Penchev, P. Bozov; Neo-clerodane diterpenoids from Scutellaria velenovskyi rech. fil. Chemical Faculty 11th Chemistry Conference, University of Plovdiv, 11 - 13 October, 2018, Plovdiv, Bulgaria.(Lecture in English)
2. P. Penchev; ¹³C NMR Interpretive Library Search (in English), 22 June 2007, 6th Chemistry Conference of Chemical Faculty of University of Plovdiv, Plovdiv 20-22 June 2007.
3. P. Penchev; Computer-Assisted Structure Elucidation of Organic Compounds by Infrared Spectroscopy (in English), 26 August 1999 at Center for Computational Quantum Chemistry at University of Georgia at Athens, USA.
4. P. Penchev; Infrared spectra interpretation by means of computer (in Bulgarian), 19 May 2000 at the Conference at Chemical Faculty, University of Plovdiv, Bulgaria.

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Lectures given by other people with particiaption of Plamen Penchev

1. K. Varmuza, P. N. Penchev, and H. Scsibrany; Maximum common substructures of organic compounds exhibiting similar infrared spectra. Mдnnedorf (Switzerland): 1997-11-17, short lecture. 12. CIC-Workshop der Fachgruppe Chemie-Information-Computer in der Gesellschaft Deutscher Chemiker, 1997-11-16 to 11-18.
2. Nikolay T.  Kochev, Plamen N. Penchev, Atanas T. Terziyski, George N. Andreev; Software Approaches for Structure Information Acquisition and Training of Chemistry Students. 26^thInternational Conference on Information and Communication Technologies and Programing, 26-29 June 2001, Sofia, Bulgaria.

K. Varmuza, N.T. Kochev , P.N. Penchev. Evaluation of Hitlists from IR Library Searches by The Concept of Maximum Common Substructures. International Congress on Analytical Sciences, Tokyo, August 2001.