Open AccessComplexes of Copper with a Flexible Bis-benzimidazole Ligand
Author(s) -
G. Bernardinelli,
Anita Kübel-pollak,
Stéphane Rüttimann,
A. F. Williams
Publication year - 1992
Publication title -
chimia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.387
H-Index - 55
eISSN - 2673-2424
pISSN - 0009-4293
DOI - 10.2533/chimia.1992.155
Subject(s) - denticity , chemistry , ring (chemistry) , crystallography , ligand (biochemistry) , copper , chelation , crystal structure , benzimidazole , cyclohexane conformation , metal , stereochemistry , derivative (finance) , molecule , hydrogen bond , inorganic chemistry , receptor , organic chemistry , biochemistry , financial economics , economics
The flexible bidentate ligand 1,3-bis(benzimidazol-2-yl)propane, L3, and its N-methylated derivative L4, form complexes with CUI and CUII. The X-ray crystal structure of [Cu(L4)(MeCN)] (PF6) (1) shows a trigonal coordination of the CuI with the eight-membered chelate ring adopting a half-chair conformation. With CuII in EtOH, L3 forms dimeric [(L3)Cu(μ-EtO)2Cu(L3)](ClO4)2 · 2EtOH (2) whose X-ray crystal structure shows CuII in a distorted square-planar environment with one bidentate ligand and two bridging ethoxides. The chelate ring now has a boat-chair conformation which forms a hydrophobic pocket around the metal.