NMR study of the coordinating behavior of 2,6-bis(benzimidazol-2?-yl)pyridine

Autor:	Jonathan Nieto‐Martínez, Rosalinda Contreras, Agueda E. Ceniceros-Gómez, Ángel Ramos-Organillo, Julio Hernández-Díaz, Silvia E. Castillo-Blum
Rok vydání:	2000
Předmět:	chemistry.chemical_compound chemistry Hydrogen bond Ligand Pyridine Heteroatom Inorganic chemistry Ionic bonding Imidazole General Chemistry Nuclear magnetic resonance spectroscopy Carbon-13 NMR Medicinal chemistry
Zdroj:	Heteroatom Chemistry. 11:392-398
ISSN:	1098-1071 1042-7163
DOI:	10.1002/1098-1071(2000)11:6<392::aid-hc6>3.0.co;2-g
Popis:	The coordination sites of 2,6- bis(benzimidazol-2-yl)pyridine (1) toward protons and the diamagnetic metal ions Li ,N a , and Co 3 were investigated by NMR spectroscopy. Variable tem- perature 1 H and 13 C NMR experiments were performed on 1 in order to evaluate the tautomeric equilibrium and hydrogen bonding. Imidazole dicoordinated aro- matic nitrogen atoms were protonated by trichloroa- cetic acid and the three N-dicoordinated atoms by fuming H2SO4. Reactions of the ligand 1 and benzim- idazole 2 with metallic sodium or LiH afforded an- ionic species; the alkali metal ions appeared solvated by THF, but not by the ligands 1 or 2. In contrast, reaction of 1 with Co(III) produces the stable cation (Co(1-H)2) with cobalt ion coordinated by two mol- ecules of the monodeprotonated ligand. 2000 John Wiley & Sons, Inc. Heteroatom Chem 11:392-398, 2000
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5e1e900bf53424c016ef30450abe12a9 https://doi.org/10.1002/1098-1071(2000)11:6<392::aid-hc6>3.0.co Zobrazit plný text záznamu