|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.46A [2007] >
IJC-A Vol.46A(09) [September 2007] >
| Title: | Synthesis, structure and luminescence behaviour of copper(II)cyanato complexes containing bidentate N-donor Schiff bases |
| Authors: | Chowdhury, Habibar
Ghosh, Rajarshi
Sarkar, Bhola Nath
Banerjee, Sankar Prasad
Ghosh, Barindra Kumar |
| Issue Date: | Sep-2007 |
| Publisher: | CSIR |
| IPC Code: | Int. Cl.⁸ C07C25/02; C07F1/08 |
| Abstract: | Two Schiff bases, N-[(pyridin-2-yl)formylidene]benzylamine (pfba) and N-[(pyridin-2-yl)benzylidene]benzylamine (pbba) have been prepared and used to synthesize four pentacoordinated copper(II)cyanato complexes of type [Cu(L)₂(NCO)]X (1-4) [L = pfba, X = ClO₄⁻, 1; L = pfba, X = PF₆⁻, 2; L = pbba, X = ClO₄⁻, 3; L = pbba, X = PF₆⁻, 4]. The complexes have been characterized on the basis of microanalytical, spectroscopic, magnetic, electrochemical and other physicochemical properties. Structure of [Cu(pbba)₂(NCO)]ClO₄ (3) has been solved by X-ray diffraction measurement. Structural analysis reveals that the copper(II) centre in 3 has a distorted trigonal bipyramidal geometry with a CuN₅ chromophore coordinated through four N atoms of two bidentate pbba units and one N atom of terminal cyanate. 3 forms a one-dimensional chain through C-H…O hydrogen bond, π…π and C-H…π interactions. The complexes 1-4 exhibit d-d transition and n-π*/π-π* charge transfer transition. Electrochemical electron transfer study reveals copper(II)-copper(I) reduction in methanolic solutions. High-energy intraligand ¹(π-π*) fluorescence at room temperature and intraligand 3(π-π*) phosphorescence in glassy solutions (MeOH at 77 K) and in solid states are seen in all the complexes. |
| Page(s): | 1393-1400 |
| ISSN: | 0376-4710 |
| Source: | IJC-A Vol.46A(09) [September 2007]
|
|
