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Two highly unsymmetrical tetradentate (N3O) Schiff base copper(II) complexes: Template synthesis, structural characterization, magnetic and computational studies by Ambarish Ray; Dipankar Maity; Anup Pramanik; Kalyan K. Das; Mahasweta Nandi; Asim Bhaumik; M. Nethaji; Swastik Mondal; Monika Mukherjee; Mahammad Ali is a Chemistry article available to read on EtoBox.

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Unsymmetrical tetradentate Schiff base ligand Copper(II) complexes Synthesis Crystal structure Magnetic and DFT studies Olefine epoxidation a b s t r a c t Two new copper(II) complexes, [Cu 2 (L 1 ) 2 ](ClO 4 ) 2 ( ) and [Cu(L 2 )(ClO 4 )] (2), of the highly unsymmetrical tetradentate (N 3 O) Schiff base ligands HL 1 and HL 2 (where HL 1 = N-(2-hydroxyacetophenone)-bis-3aminopropylamine and HL 2 = N-(salicyldehydine)-bis-3-aminopropylamine) have been synthesised using a template method. Their single crystal X-ray structures show that in complex 1 two independent copper(II) centers are doubly bridged through phenoxo-O atoms (O1A and O1B) of the two ligands and each copper atom is five-coordinated with a distorted square pyramidal geometry. The asymmetric unit of complex 2 consists of two crystallographically independent N-(salicylidene)-bis(aminopropyl)aminecopper(II) molecules, A and B, with similar square pyramidal geometries. Cryomagnetic susceptibility measurements (5-300 K) on complex 1 reveal a distinct antiferromagnetic interaction with J = À23.6 cm À1 , which is substantiated by a DFT calculation (J = À27.6 cm À1 ) using the B3LYP functional. Complex 1, immobilized over high

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Author

Ambarish Ray; Dipankar Maity; Anup Pramanik; Kalyan K. Das; Mahasweta Nandi; Asim Bhaumik; M. Nethaji; Swastik Mondal; Monika Mukherjee; Mahammad Ali

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0277-5387)

Published

2009

Language

EN

Field

Chemistry (Physical Sciences)