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Liviu Birzan

Institute of Organic Chemistry " C. D. Nenitescu" of Romanian Academy, Bucharest, Romania

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Born: 1960

Interests: organic synthesis, structural analysis, heterocyclic and aromatic chemistry, organic electrochemistry

Details:
I am interested in azulene and its derivatives, but also in the chemistry of the heterocyclic systems that possess a positive charge, such as pyrylium or pyridinium salts. Because my chemistry looks like a painter easel, I also studied the electronic and magnetic spectra of the resulted new compounds. For completing the rainbow hues, some azo groups were dropped in the picture. And, finally, the paint quality was studied using electrochemical methods.

Selected publications:
• Liviu Birzan, Victorita Tecuceanu, Cristian Enache, Alexandru C. Razus. Molecular Ions Resulted in Mass Spectrometer for 1, 3-bis(phenylselanyl)-azulenes and Their Oxidized Products. Revista de Chimie (Buc), 64(11), pp. 1255-1260, 2013.
• Maria-Laura Soare, Eleonora-Mihaela Ungureanu, Emilian Georgescu, Liviu Birzan . Synthesis and electrochemical characterization of substituted indolizine carboxylates. Journal of Serbian Chemical Society, 78(6), pp. 827-838, 2013.
• Liviu Birzan, Victorita Tecuceanu, Cristian Enache, Alexandru C. Razus, . Fragmentation in Mass Spectrometer of some Phenylselanylated Azulenes and of the Corresponding Selenoxide and Selenone. Revista de Chimie (Buc), 64(7), pp. 701-706, 2013.
• Alexandru C. Razus, Liviu Birzan, Victorita Tecuceanu, Mihaela Cristea, Anamaria Hanganu. Colored Benzo-crown ethers substituted with (azulene-1-yl) azo chromophores. Synthesis and properties. Revue Roumaine de Chimie, 57(11), pp. 985-993, 2012.
• Soare, Maria-Laura; Ungureanu, Eleonora-Mihaela; Georgescu, Emilian; Birzan, Liviu. Synthesis and Electrochemical Characterization of Substituted Pyrrolo[1, 2-c]pyrimidine Carboxylates. Revists de Chimie (Buc), 63(11) , pp. 1089-1095, 2012.
• ALEXANDRU C. RAZUS, LIVIU BIRZAN*, MIHAELA CRISTEA, VICTORITA TECUCEANU, CRISTIAN ENACHE. Synthesis of 4-Azulen-1-yl-pyrylium Salts 2- and 6-Substituted with either Naphthyls or Naphthyl and Phenyl Groups. Revista de Chimie (Bucuresti), 63(7), pp. 660-6, 2012.
• Liviu Birzan, Victorita Tecuceanu, Cristian Enache. Mass Spectra Splitting of some Compounds Containing Both Azulenic and Benzocrown Ethers Moieties. Revista de Chimie (Bucuresti) , 63(4), pp. 375-379, 2012.
• Eleonora-Mihaela Ungureanu, Cristina-Andreea Amarandei, Ramona Weisz, Alexandru Constantin Razus, Liviu Birzan. Azulenyl-Pyranylium Salts For Anion Recognition. Revista de Chimie (Bucuresti), 63(3), pp. 259-64, 2012.
• Eleonora-Mihaela Ungureanu, George-Octavian Buica, Alexandru C. Razus, Liviu Birzan, Ramona Weisz, Magdalena-Rodica Bujduveanu. Electrochemical Study on 4-(azulen-1-yl)-2, 6-bis(2-furyl)- and 4-(azulen-1-yl)-2, 6-bis(2-thienyl)-pyridines. Revista de Chimie (Bucuresti), 63(1), pp. 27-33, 2012.
• Alexandru C. Razus, Liviu Birzan, Mihaela Cristea, Victorita Tecuceanu, Cristian Enache. Extended aromatic pi-electron conjugated dyes with three azo bonds and either. Dyes and Pigments, 92, pp. 1166-76, 2012.
• Maria-Laura Soare, Magdalena-Rodica Bujduveanu, Eleonora-Mihaela Ungureanu, Emilian Georgescu and Liviu Birzan. Comparative Electrochemical Studies On Substituted Benzoyl Indolizine-1-Carboxylates. Revue Roumain Chimie, 56(10-11), pp. 1011-9., 2011.
• Alexandru C. Razus, Liviu Birzan, Mihaela Cristea, Eugenia, Andreea Dragu, Anamaria Hanganu. Azulen-1-yl Diazenes Substituted at C-3 with Phenyl-Chalcogene Moieties: Dye Synthesis, Product Characterization and Properties. Monatshefte fur Chemie-Chemical Monthly, 142, pp. 1271-82., 2011.
• Alexandru C. Razus, Liviu Birzan, Mihaela Cristea, Victorita Tecuceanu. 4-(Azulen-1-yl) Six-Membered Heteroaromatics Substituted with. Journal of Heterocyclic Chemistry, 48(5), pp. 1019-27, 2011.
• Alexandru C. Razus, Liviu Birzan, Victorita Tecuceanu, Mihaela Cristea, Anamaria Hanganu. Benzo- And Dibenzo-Crown Ethers Substituted With (Azulene-1-Yl)-Imino Or (Azulene-1-Yl)-Carbonyl Groups. Revue Roumaine de Chimie, 56, pp. 335-9, 2011.
• Alexandru Constantin Razus, Liviu Birzan, Victorita Tecuceanu, Cristian Enache. The Mass Spectroscopy Scissions of Some Trisazoic Compounds Containing One or Two Azulene Moieties. Revista de Chimie (Bucuresti), 62(4), pp. 361-4, 2011.
• George-Octavian Buica, Eleonora-MihaelaUngureanu, Liviu Birzan, Alexandru C. Razus, Magdalena-Rodica Bujduveanu. Films of poly(4-azulen-1-yl-2, 6-bis(2-thienyl)pyridine) for heavy metal ions. Electrochimica Acta, 56(14), pp. 5028-5036 , 2011.
• Alexandru C. Razus, Simona Nica, Liliana Cristian, Matei Raicopol, Liviu Birzan, Andreea Eugenia Dragu. Synthesis and physico-chemical properties of highly conjugated azo-aromatic moieties at C3-position of azulene. Dyes and Pigments, 91, pp. 55-61, 2011.
• Eleonora-Mihaela Ungureanu , George-Octavian Buica Alexandru Razus , Liviu Birzan , Elena Diana Giol. Study on 5-(azulen-1-ylmethylene)-2, 2-dimethyl-1, 3-dioxane-. Monatshefte fur Chemie-Chemical Monthly, 142, pp. 243-50, 2011.
• Ramona Weisz, Cristina-Andreea Amarandei, Eleonora-Mihaela Ungureanu, Liviu Birzan. Etude sur la reconnaissance des anions par des méthodes spectrales . U. P. B. Sci. Bull., Serie B, , 72(4), pp. 131-44, 2010.
• Eleonora-Mihaela Ungureanu, CA. Amarandei, Dan Ion Caval, George Octavian Buica, Alexandru C. Razus, Liviu Birzan. Electrochemical synthesis of azo azulene films. Journal of Optoelectronics and Advanced Materals, 12(8), pp. 1805-10, 2010.
• Alexandru C. Razus, Liviu Birzan, Victorita Tecuceanu, Simona Nica and Cristian Enache. The Fragmentation Of Several Azulen-1-yl Diazenes And Bis Diazenes In Mass Spectrometer. Rev. Chim (Buc), 61, pp. 55-57, 2010.
• Alexandru C. Razus, Liviu Birzan, Mihaela Cristea, Eleonora-Mihaela Ungureanu, Mariana-Stefania Cretu. Investigation on the correlation between the structure of azulen-1-ylbenzothiazol-2-yl diazenes and their properties. Acidity and electrochemical redox potentials. Dyes and Pigments, 86, pp. 1-5, 2010.
• Alexandru C. Razus, Liviu Birzan, Mihaela Cristea, Eleonora-Mihaela Ungureanu and Dan-Ion Caval. Electrochemical Behaviour Of Bis Diazenyls Containing Azulenyl Moieties. Revue Roumaine de Chimie, 54(11-12), pp. 913-922, 2009.
• Alexandru C. Razus, Liviu Birzan, Liliana Cristian, Victorita Tecuceanu. Synthsis and properties of azulene-containing dioxane. Arkivoc, xi, pp. 31-44, 2009.
• Alexandru C. Razus, Liviu Birzan, Victorita Tecuceanu, Mihaela Cristea, Cristian Enache. Mass Spectra Splitting of some Compounds Containing Both Azulenic and Thiophene Moieties. Rev. Chim. (Bucuresti), 60 (4), pp. 373-6, 2009.
• Alexandru C. Razus, Liviu Birzan, Oana Lehadus, Cristian Enache. Pathways for Mass Spectra Fragmentation of Azulen-1-yl Substituted Six-membered Heterocycles. Rev. Chim. (Bucharest), 60(3), pp. 274-277, 2009.
• Alexandru C. Razus, Liviu Birzan, Mihaela Cristea, Bogdan Popa. New bis Aromatic Diazenes Containing Azulene-1-yl Moiety. II. New bis Aromatic Diazenes Containing Two Azulen-1-yl Moieties. Synthesis, Product Characterization, Electronic, NMR Spectra and Basicity. Dyes & Pigments, 82, pp. 216-25, 2009.
• Alexandru C. Razus, Liviu Birzan, Mihaela Cristea, Victorita Tecuceanu, Liliana Blanariu and Cristian Enache . Novel mono- and bis-azo dyes containing the azulen-1-yl moiety: Synthesis, characterization, electronic spectra and basicity. Dyes Pigm. , 80(3), pp. 337-342, 2009.
• S. Lupu, C. Lete, C. Mihailciuc, A. Razus, L. Birzan. Senzori electrochimici pentru analize clinice si de mediu. PRINTECH, Bucuresti, 2008.
• Eleonora-Mihaela Ungureanu, Alexandru C. Razus, Liviu Birzan, Mariana-Stefania Cretu, George-Octavian Buica. Electrochemical Study Of Azo-Azulene Compounds. Electrochim. Acta, 53(24), pp. 7089-99, 2008.
• Alexandru C. Razus, Liviu Birzan, Oana Zaharia and Cristian Enache. 2-(Azulen-1-yl)-4, 6-diphenyl Substituted Six-membered Heteroaromatics. J. Heterocycl. Chem. , 45, pp. 1139-48, 2008.
• Alexandru C. Razus, Claudia Pavel, Oana Lehadus, Simona Nica and Liviu Birzan. Synthesis And Properties Of [1, 6]Biazulenyl Compounds. Tetrahedron, 64, pp. 1792-1797, 2008.
• Alexandru. C. Razus, Liviu Birzan, Victorita Tecuceanu, Mihaela Cristea and Cristian Enache. Condensation of alkylazulenes with thiophene-2-carboxaldehyde and the corresponding azomethines. Arkivoc, xi, pp. 210-226, 2008.
• Alexandru C. Razus, Liviu Birzan, Victorita Tecuceanu, Mihaela Cristea, . Azulene Derivatives Soluble In Polar Solvents. 1-(Azulen-1-yl)-2-(Thien-2- or 3-yl)-Ethenes. Rev. Roum, Chim, 52(1-2), pp. 189-94., 2007.
• Alexandru C. Razus, Liviu Birzan, Claudia Pavel, Oana Lehadus, Andreea Corbu, Filip Chiraleu and Cristian Enache. Azulene-substituted Pyridines and Pyridinium Salts. Synthesis and Structure. 2. Azulene-substituted Pyridinium salts. Journal of Heterocyclic Chemistry, 44, pp. 251-60, 2007.
• Alexandru C. Razus* Liviu Birzan, Claudia Pavel, Oana Lehadus, Andreea Corbu, Filip Chiraleu and Cristian Enache. Azulene-substituted Pyridines and Pyridinium Salts. Synthesis and Structure. 1. Azulene-substituted Pyridines. Journal Heterocyclic Chemistry, 44, pp. 245-50, 2007.
• Alexandru C. Razus, Liviu Birzan, Nina Mirela Surugiu, Andreea Cristina Corbu and Filip Chiraleu. Syntheses of azulen-1-yl-benzothiazol-2-yl diazenes. Dyes and Pigments, 74(1), pp. 26-33, 2007.
• A. C. Razus, N. M. Surugiu, L. Cristian, A. Negoiescu, O. Zaharia, L. Birzan. Reactions of azulenes with Derivatives of Aromatic Dicarboxylic Acids. Revue Roumaine de Chimie, 51(7-8), pp. 601-8, 2006.
• Eleonora M. Ungureanu, Alexandru. C. Razus, Liviu Birzan, George Buica, Mariana Cretu and Enache Cristian. Electrochemical chlorination of azulenic derivatives. Insight into mechanism of anodic oxidative chlorination. Electrochimica Acta, 52, pp. 794-803, 2006.
• Alexandru C. Razus, Liviu Birzan, Andreea Corbu, Oana Zaharia and Cristian Enache. Synthesis and Properties of 4-(3-Substituted azulen-1-yl)-2, 6-diphenyl-pyridines. Arkivoc, 12, pp. 121-9, 2006.
• Alexandru C. Razus, Liviu Birzan, Claudia Pavel, Oana Lehadus, Andreea Cristina Corbu and Cristian Enache. Azulene-substituted Pyranylium Salts. Syntheses and Products Characterization. J. Heterocyclic Chem, 43, pp. 963-77, 2006.
• Alexandru C. Razus, Carmen Nitu, Victorita Tecuceanu and Liviu Birzan. Pathways for the solvent-free condensation between schiff bases and methylenic compounds. Rev. Roum. Chim. , 50, pp. 729-36, 2005.
• A. C. Razus, L. Birzan, S. Nae, O. L. Lehadus, C. Pavel and O. Costan. Azulenic & #61538; -ketones. Synthesis, properties and reactions to form five membered aromatic heterocycles. Arkivoc, x, pp. 71-85, 2005.
• A. C. Razus, L. Birzan, S. Nae, L. Cristian, F. Chiraleu, M. Maganu, V. Cimpeanu and L. Tarko. 3-Substituted azulene-1-(4’-methylbenzenes). Preparation and study of spectral characteristics. Rev. Roum. Chim, 49(10), pp. 455-61, 2004.
• A. C. Razus, L. Birzan, S. Nae, L. Cristian and F. Chiraleu. Azulene-1-azopyridine 1’-oxides. Dyes and Pigments, 57, pp. 223-33, 2003.
• A. C. Razus, L. Birzan, S. Nae, V. Tecuceanu and L. Tarko. The coupling capacity of diazotized N-substituted aminopyridines – A quantum maehanical aproach”. Rev. Roum. Chim. , 48(3), pp. 191-6, 2003.
• A. C. Razus, L. Birzan, S. Nae, M. N. Surugiu and V. Cimpeanu. Azulene-1-azo-2’-thiazoles. Synthesis and Properties. Journal of Heterocyclic Chemistry, 40, pp. 995-1004, 2003.
• A. C. Razus; L. Birzan; S. Nae. The avoidance of antiaromtic transition state in the nucleophilic aromatic substitution. Rev. Roum. Chim. , 47(5), pp. 421-35, 2002.
• A. C. Razus, L. Birzan, S. Nae, S. A. Razus, L. Cristian, V. Cimpeanu. Azulene-1-azopyridine, bis. pyridinium salts. Rev. Chim. (Buc), , 53(11), pp. 728-32, 2002.
• A. C. Razus, L. Birzan, P. Filip, M. Danila, V. Tecuceanu, L. Cristian. Considerations on the fragmentations of some 1-Substituted Azulenes in the mass Spectrometer. Rev. Chim. (Buc), , 53(10), pp. 641-5, 2002.
• A. C. Razus, L. Birzan, S. Nae, C. Nitu, V. Tecuceanu and V. Cimpeanu. 1, 1’-Biazulene derivatives. Syntheses and reactions. Arkivoc, ii, pp. 142-53, 2002.
• A. C. Razus; L. Birzan; S. Nae; S. A. Razus; V. Cimpeanu; C. Stanciu. Azulene-1-azopyridines, Synthesis and N-alkylation at pyridine moiety. Synth. Commum, 32, pp. 825-37, 2002.
• A. C. Razus; L. Birzan, S. Nae, C. Nitu, V. Cimpeanu. Procedeu de diazotare-cuplare pentru obtinerea azulen-1-azo-(4’-nitrobenzenilor). Rev. Chim. (Buc), , 52, pp. 188-92, 2001.
• A. C. Razus; C. Nitu; S. Carvaci; L. Birzan; S. A. Razus; M. Pop; L. Tarko. Synthesis and reactions of N-(azulen-1-ylmethylene)arylamines. J. Chem. Soc., Perkin Trans. 1, pp. 1227-33, 2001.
• A. C. Razus, L Birzan, S. A. Razus si V. Horga. Halogenation of 1-arylazo-azulenes. Rev. Roum. Chim, 44(3), pp. 235-249, 1999.
• D. L. S. Yokotsuji; W. P. Dailey; A. S. Kende: L. Birzan; L. Kun. Generation, direct observation under matrix isolation conditions, and ab initio calculations for 2-azacyclopenta-2, 4-dien-1-one. J. Phys. Chem, 99, pp. 15870-3, 1995.


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