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Interaction of copper(II) complexes with bis(p-nitrophenyl)phosphate: Structural and spectral studies |
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| Authors: | Thirumanasekaran Dhanalakshmi Eringathodi Suresh Mallayan Palaniandavar |
| Institution: | a Centre for Bioinorganic Chemistry, School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, India b Analytical Science Discipline, Central Salt and Marine Chemicals Research Institute, Bhavnagar 364 002, India c Department of Chemistry, University of Neuchatel, Neuchatel, Switzerland |
| Abstract: | When the complexes Cu(L1)(H2O)](ClO4)21, where L1 = 4-methyl-1-(pyrid-2-ylmethyl)-1,4-diazacycloheptane, and Cu(L2)Cl2] 2, where L2 = 4-methyl-1-(quinol-2-ylmethyl)-1,4-diazacycloheptane are interacted with one/two equivalents of bis(p-nitrophenylphosphate, (p-NO2Ph)2PO2, BNP), no hydrolysis of BNP is observed. From the solution the adducts of copper(II) complexes Cu2(L1)2((p-NO2Ph)2PO2)2]-(ClO4)23 and Cu(L2)((p-NO2Ph)2PO2)2]·H2O 4 have been isolated and structurally characterised. The X-ray crystal structure of 3 contains two Cu(L1) units bridged by two BNP molecules. The Cu···Cu distance (5.1 Å) reveals no Cu-Cu interaction. On the other hand, the complex 4 is mononuclear with Cu(II) coordinated to the 3N ligand as well as BNP molecules through phosphate oxygen. The trigonality index (τ, 0.37) observed for 4 is high suggesting the presence of significant trigonal distortion in the coordination geometry around copper(II). The complexes are further characterized by spectral and electrochemical studies. |
| Keywords: | Phosphate ester hydrolysis Copper(II) complexes Tridentate 3N ligands Bis(p-nitrophenyl)phosphate Cu(II)/Cu(I) redox potential |
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