UNUSUAL COORDINATION OF TRIPODAL NN3S3 DONOR LIGAND WITH NICKEL(II) -SINGLE-CRYSTAL X-RAY STRUCTURE OF H2CH2N(CH2CH2N=CH(C4H3S))(2))(CH3CN)(H2O)](PF6)(2)

Citation
A. Das et al., UNUSUAL COORDINATION OF TRIPODAL NN3S3 DONOR LIGAND WITH NICKEL(II) -SINGLE-CRYSTAL X-RAY STRUCTURE OF H2CH2N(CH2CH2N=CH(C4H3S))(2))(CH3CN)(H2O)](PF6)(2), Polyhedron, 14(4), 1995, pp. 495-499
Citations number
14
Categorie Soggetti
Chemistry Inorganic & Nuclear",Crystallography
Journal title
ISSN journal
02775387
Volume
14
Issue
4
Year of publication
1995
Pages
495 - 499
Database
ISI
SICI code
0277-5387(1995)14:4<495:UCOTND>2.0.ZU;2-E
Abstract
Reaction of Ni(acetate)(2).6H(2)O with a potentially heptentate Schiff base ligand, tris[4-(2-thienyl)-3-aza-3-butenyl]amine [(thiophene),tr en], resulted in the formation of an unexpected octahedral Ni-II compl ex with an NiN4 core and the remaining two coordination sites occupied by solvent molecules; An X-ray crystal structure of the complex estab lished the unusual cleavage at one of the three alpha-imino bonds and revealed that it deviates from the usual mono-capped trigonal prismati c coordination polyhedron designed for this type of complex. The compl ex molecule has an approximate plane of symmetry(C-s) rather than the three-fold axis (C-3) normally observed for this type of complex and i s the first example where the apical 'unique' nitrogen approaches the Ni-II as closely as the other three nitrogens of the ligand.