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Synthesis and characterization of a nano Cu2 cluster

Sayantan Pathak, Niladri Biswas, Barun Jana, Tanmay K Ghorai

Volume 2, Issue 4, Page 275-279, Year 2017 | DOI: 10.5185/amp.2017/414

Keywords: Synthesis, slow evaporation, copper nano cluster, X-ray crystallography, CV, BVS calculation.

Abstract: The synthesis and crystal structure of Cu2(C6H5COO)4(C6H5COOH)2 (1) is herein reported. However, our intention was to incorporate Pb into the present system and make a new high nuclearity heteronuclear Cu-Pb cluster with magnetic or antibacterial properties. For its synthesis, first Cu (NO3)2.3H2O (2mmol) and PhCOOH (10mmol) was dissolved in a mixed solvent MeCN/EtOH (10/10, v/v); separately Pb(NO3)2 (1mmol) was dissolved in EtOH/H2O (20/5, v/v) and added drop-wise to the previous mixture. The mixture was stirred vigorously for half an hour with step-wise addition of NaN3 (2mmol). The heterogenous reaction mixture was filtered and the deep greenish filtrate was stored at ambient condition. In four weeks, green single crystals were generated at the bottom of the flask. Single crystal X-ray measurement shows the formation of the title compound, where Cu atoms are in +2 oxidation state that is further confirmed by BVS calculation. The Cu-Cu distance in the molecular structure is found to be 2.608 (2) Å, which indicates a Cu-Cu bond in the molecule. Each Cu atom is bonded to four oxygen atoms of two benzoate ligands and one oxygen atom of a benzoic acid molecule. The octahedral geometry of the copper(II) atoms are fulfilled by an additional copper-copper bond. The most interesting in complex 1 is both intra and intermolecular hydrogen and C-H-C bonding present in the system. The length of nano molecular size of the Cu2 cluster is found to be 1.55nm. The antibacterial study of complex 1 has been checked and it has no such high antibacterial activity. Copyright © 2017 VBRI Press

Advanced Materials Proceedings

The official journal of the International Association of Advanced Materials (IAAM)