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Department of Chemistry, Sidho-Kanho-Birsha University, Purulia-723 104, West Bengal, India Department of Chemistry, University of North Bengal, Darjeeling-734 013, West Bengal, India E-mail: mr.bbiswas@rediffmail.com, icbbiswas@gmail.com Department of Chemistry, University of Kalyani, Kalyani-741 235, West Bengal, India Manuscript received online 29 August 2018, revised 08 October 2018, accepted 09 October 2018 Synthesis and structural characterization of a cobalt(II) complex, [Co(2,2´-dpa)2 (NO3 )]NO3 (1) [2,2´-dpa = 2,2´-dipyridylamine] has been reported. Single crystal X-ray diffraction study reveals that 1 crystallizes in monoclinic system with P21 /n space group. Investigation on supramolecular investigation reveals that counter anionic nitrate ion plays a crucial role in the construction of long range 3D crystalline structure. Room temperature magnetic susceptibility measurement predicts the high spin nature of the cobalt(II) compound. The cobalt(II) complex has been evaluated to mimics the functional sites of phenoxazinone synthase enzyme in acetonitrile medium. The cobalt(II) complex significantly able to promote the oxidative coupling of 2- aminophenol (2-AP) to 2-aminophenoxazin-3-one under aerobic condition with significant turn over number, kcat = 1.46×104 h–1. ESI-MS of the reaction mixture recommends that the course of catalysis proceeds through substrate-enzyme adduct formation. Finally, detailed quantum chemical calculations have firmly supported the experimental observations. |
