Search Results - "Kolev, Tsonko"

Journal Article

Spectroscopic and structural elucidation of amino acid derivatives and small peptides: experimental and theoretical tools

by Kolev, Tsonko Spiteller, Michael Koleva, Bojidarka Published in Amino acids (01.01.2010)

“...This mini review deals with the modern aspects of the spectroscopy and structural elucidation of amino acid derivatives and small biologically active...”

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Journal Article

Structural and Spectroscopic Elucidation of Tetrapetide Glycyl-L-Prolyl-Glycyl-Glycine and Its Hydrogensquarate

by Kolev, Tsonko Published in Protein and peptide letters (01.07.2008)

“...The IR-spectroscopic and structural elucidation of tetrapeptide glycyl-L-prolyl-glycyl-glycine and its hydrogensquarate was performed by employing...”

Journal Article

Polarized spectroscopic elucidation of N-acetyl-l-cysteine, l-cysteine, l-cystine, l-ascorbic acid and a tool for their determination in solid mixtures

by Koleva, Bojidarka Spiteller, Michael Kolev, Tsonko Published in Amino acids (01.01.2010)

“...Method of linear polarized vibrational (both IR- and Raman) spectroscopy of oriented colloids in nematic host is applied on N-acetyl-l-cysteine, l-cysteine,...”

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Journal Article

Tyrammonium 4-nitrophthalate dihydrate: structural and spectroscopic elucidation

by Kolev, Tsonko Koleva, Bojidarka B Seidel, Rüdiger W Mayer-Figge, Heike Spiteller, Michael Sheldrick, William S Published in Amino acids (01.01.2009)

“...Tyrammonium 4-nitrophthalate has been synthesized and its structural and spectroscopic properties elucidated by single-crystal X-ray diffraction, solid-state...”

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Journal Article

Synthesis, spectroscopic analysis and structure deduction of gold(III), palladium(II) and platinum(II) complexes with the tripeptide glycyl-l-phenylalanyl-glycine

by Koleva, Bojidarka B Kolev, Tsonko Lamshöft, Marc Spiteller, Michael Published in Transition metal chemistry (Weinheim) (01.10.2008)

“...The coordination behaviour of the tripeptide glycyl-l-phenylalanyl-glycine (H-Gly-Phe-Gly-OH) with Au(III), Pd(II), and Pt(II) in both solution and in the...”

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Journal Article

2-(Phenylethyl)ammonium hydrogensquarate hemihydrate: crystal structure, solid-state IR-spectroscopic and theoretical characterization

by Ivanova, Bojidarka B Seidel, Rüdiger W Kolev, Tsonko Sheldrick, William Spiteller, Michael Published in Amino acids (01.06.2010)

“...The title compound, 2-(phenylethyl)ammonium hydrogensquarate hemihydrate, was synthesized and structurally and spectroscopically characterized by a single...”

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Journal Article

L-Leucinamide hydrogensquarate: spectroscopic and structural elucidation

by Kolev, Tsonko Zareva, Sonya Mayer-Figge, Heike Spiteller, Michael Sheldrick, William S Koleva, Bojidarka B Published in Amino acids (01.10.2009)

“...The hydrogensquarate [LeuNH(2)] (HSq) of L-leucinamide has been synthesized and its structure has been determined by single crystal X-ray diffraction. A three...”

Journal Article

Solid-state linear polarized IR-spectroscopy of croconic and rhodizonic acids

by Kolev, Tsonko Koleva, Bojidarka B Spiteller, Michael Published in Central European journal of chemistry (01.09.2008)

“...The applications of linear-polarized IR-spectroscopy to oriented colloid suspensions in a nematic host are demonstrated with croconic and rhodizonic acids. The...”

Journal Article

Solid-state IR-LD spectroscopy of codeine and N-norcodeine derivatives

by Bakalska, Rumyana Ivanova, Bojidarka Kolev, Tsonko Published in Central European journal of chemistry (01.09.2006)

“...Linear-dichroic infrared spectra (IR-LD) of 3-ethoxy-4-(N-norcodeino-)cyclobutene-1,2-dione (1) and codeine dihydrogenphosphate (Codeinum phosphoricum) (2),...”

Journal Article

Stabilization of Neutral NH2-R-COOH Form of the Antihypertensive Peptides L-Valyl-L-Prolyl-L-Proline and L-Isoleucyl-L-Prolyl-L-Proline

by Kolev, Tsonko Koleva, Bojidarka B Stoineva, Ivanka Jakimova, Boryana Tchorbanov, Bojidar Published in Protein and peptide letters (01.02.2009)

“...Spectroscopic and structural elucidation of the peptides L-Valyl-L-Prolyl-L-Proline (1) and L-Isoleucyl-L-Prolyl- L-Proline (2) are reported on the basis of...”

Journal Article

Solid-state IR-LD spectroscopic and theoretical analysis of arginine-containing peptides

by Kolev, Tsonko Published in Biopolymers (01.09.2006)

“...Structural prediction and IR‐characteristic bands assignment of arginine‐containing tri‐ and tetrapeptides glycyl‐glycyl‐arginine (GGArg) and...”

Journal Article

Synthesis, spectroscopic and structural elucidation of sympathomimetic amine, tyraminium dihydrogenphosphate

by Kolev, Tsonko M Koleva, Bojidarka B Spiteller, Michael Sheldrick, William S Mayer-Figge, Heike Published in Amino acids (01.02.2009)

“...The synthesis, isolation, spectroscopic and structural elucidation of sympathomimetic amine, tyramine dihydrogenphosphate are of interest due to its biological...”

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Journal Article

(±)-Ethyl 6,7-dimethoxy-1-(1H-pyrrol-2-yl)-1,2,3,4-tetrahydroisoquinoline-2-carboxylate

by Nikolova, Rosica Petrova Kolev, Tsonko Statkova-Abeghe, Stela M Shivachev, Boris Lubomirov Published in Acta crystallographica. Section E, Structure reports online (01.09.2008)

“...In the title compound, C18H22N2O4, the dihedral angle between the pyrrolyl and quinolinyl fragments is 68.97 (2)°. Two non-classical intramolecular C—H...O...”

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Journal Article

l-Argininamidium bis(hydrogensquarate)
Received 9 February 2006, accepted 3 April 2006

by Kolev, Tsonko Spiteller, Michael Sheldrick, William S Mayer-Figge, Heike Published in Acta crystallographica. Section C, Crystal structure communications (01.05.2006)

“...Cations and anions of the title compound {systematic name: 1‐[4‐(aminocarbonyl)butyl]guanidinium bis(hydrogensquarate)}, C6H17N5O2+·2C4HO4−, are connected...”

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Journal Article

Synthesis, spectroscopic and structural elucidation of tyrosinamide hydrogensquarate monohydrate

by Kolev, Tsonko M Koleva, Bojidarka B Spiteller, Michael Sheldrick, William S Mayer-Figge, Heike Published in Amino acids (01.02.2009)

“...Synthesis, isolation, spectroscopic and structural elucidation of tyrosinamide hydrogensquarate monohydrate (I) is reported on the basis of quantum chemical...”

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Journal Article

Crystal structure and spectroscopic properties of 4-acetaminopyridine and its protonated form

by Koleva, Bojidarka Nikolova, Rositsa Tchapkanov, Atanas Kolev, Tsonko Mayer-Figge, Heike Spiteller, Michael Sheldrick, William Published in Polish journal of chemical technology (01.01.2009)

“...4-Acetaminopyridine dihydrate and its protonated form, stabilized as the hydrochloride salt have been synthesized and spectroscopic elucidated in solution and...”

Journal Article

2-(3-Benzoyl-1-pyridinio)-3,4-dioxocyclobutenolate
Received 23 December 2004, accepted 27 January 2005

by Kolev, Tsonko Yancheva, Denitsa Shivachev, Boris Petrova, Rosica Spiteller, Michael Published in Acta crystallographica. Section C, Crystal structure communications (01.04.2005)

“...The title compound, C16H9NO4, also known as the 3‐benzoylpyridinium betaine of squaric acid, exhibits a dipolar electronic ground‐state structure with a...”

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Journal Article

Influence of intermolecular hydrogen bonding on IR-spectroscopic properties of ( R)-(−)-1-phenylglycinium hydrogen squarate monohydrate in solid-state. IR-LD, Raman spectroscopy an...

by Kolev, Tsonko Published in Journal of molecular structure (2007)

“...Influence of the intermolecular interactions in solid phase on the overlapped IR-spectroscopic pattern of ( R)-(−)-1-phenylglycinium hydrogen squarate...”

eBook

Linearly Polarized IR Spectroscopy: Theory and Applications for Structural Analysis

by Kolev, Tsonko Ivanova, Bojidarka
2011

“...A technique that is useful in the study of pharmaceutical products and biological molecules, polarization IR spectroscopy has undergone continuous development...”

Journal Article

Comparing of the crystal structure and spectroscopic properties of some stilbazolium dyes with enlarged π-conjugated system I. Chromophores with p-dimethylamino group

by Bakalska, Rumyana Todorova, Mina Sbirkova, Hristina Shivachev, Boris Kolev, Tsonko Published in Dyes and pigments (01.01.2017)

“...A comparative study of the structures and spectroscopic properties of two styrylquinolinium dyes:...”

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