PLANAR OR TETRAHEDRAL COORDINATION IN COPPER(II) COMPLEXES INDUCED BYBROMO SUBSTITUTION

Citation
J. Costamagna et al., PLANAR OR TETRAHEDRAL COORDINATION IN COPPER(II) COMPLEXES INDUCED BYBROMO SUBSTITUTION, Inorganica Chimica Acta, 267(1), 1998, pp. 151-158
Citations number
46
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
ISSN journal
00201693
Volume
267
Issue
1
Year of publication
1998
Pages
151 - 158
Database
ISI
SICI code
0020-1693(1998)267:1<151:POTCIC>2.0.ZU;2-C
Abstract
The diffraction study of bis(5-bromo-N-m-tolylsalicylaldiminate)copper (II) shows the copper atom in a centrosymmetric position and the two l igands displayed trans to each other in a planar environment. Two addi tional weak interactions due to Br atoms (Jahn-Teller effect) of neigh boring units complete the coordination sphere, Cu-Br = 3.662(2) Angstr om, so that the complex is formally a polynuclear two-dimensional spec ies. On the contrary, is(3,5-dibromo-N-p-tolylsalicylaldinate)copper(I I) is mononuclear and shows only the two ligands coordinated and the g eometry is distorted 'tetrahedral'. The distortion is due to intramole cular repulsion interactions. Electronic spectra of these two compound s show a single asymmetric band at 700 nm for the former, and two band s located at 650 and 850 nm for the latter. Both compounds are monocli nic, space group P2(1)/c with a=9.919(2) Angstrom, b=10.965(2) Angstro m, c=12.283(2) Angstrom, beta=105.88(1)degrees, Z=2 for the former, an d a=13.290(2) Angstrom, b=12.195(2) Angstrom, c=17.891(2) Angstrom, be ta=105.38(1)degrees, Z=4 for the latter. (C) 1998 Elsevier Science S.A .