Steric effects in pyrrole-based mixed complex systems

Raghavendra, B. S. ; Gupta, S. ; Balundgi, R. H. ; Chakravorty, A. (1976) Steric effects in pyrrole-based mixed complex systems Inorganica Chimica Acta, 18 . pp. 257-261. ISSN 0020-1693

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New systems of the type M(pyrenNR2)Br, M(pyrtnNR2Br (M = Cu, Ni), M(pyr)(pyrenNR2) (M = Cu, Ni), Cu(pyr)(pyrtnNR2) (where Hpyr is pyrrole-2-aldehyde, pyrenNR2 is Schiff base of pyr and NR2CH2 Ch2NH2and pytrnNR2 is Schiff base of pyr and NR2CH2 CH2CH2Nh2 are reported. The first two systems are shown to have planar geometry in which pyrenNR2 and pyrtnNR2 act as tridentate ligands. On the basis of magnetic, spectral and X-ray powder diffraction studies on pure crystal and on solid solutions of nickel(II) and copper(II) species, it is concluded that M(pyr)(pyrenNR2 has a 4-coordinate grossly planar geometry in which the NR2 group of pyrenNR2 fails to occupy a coordination position due to steric reasons. Models demonstrate that this steric difficulty should considerably decrease on replacement of pyrenNR2 by pyrtnNR2. Indeed the species Cu(pyr)(pyrtnNR2) have electronic spectra strongly suggestive of pentacoordination.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:95259
Deposited On:25 Oct 2012 06:53
Last Modified:25 Oct 2012 06:53

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