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Nickel(II) complexes having Imidazol-2-ylidene-N′-phenylurea ligand in the coordination sphere – syntheses and solid state structures

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Abstract

We report the syntheses and structural studies of two nickel(II) complexes of imidazol-2-ylidene- N′-phenylureate ligand of composition [{ImtBuNCON(H)Ph}2Ni(acac)2](1) and [(C6H5NH2)2Ni(acac)2][ImMes NCON(H)Ph] (2). The nickel complex 1 was readily prepared by the reaction of nickel(II) acetylacetonate [Ni(acac)2] with imidazol-2-ylidene-N′-phenylureate ligand [Im tBuNCON(H)Ph] (L1) in THF under reflux condition for 72 h. The nickel complex 2 was obtained by the reaction of [Ni(acac)2], mesityl derivative of imidazol-2-ylidene-N′-phenylureate ligand [Im MesNCON(H)Ph] (L2) in the presence of aniline as base under reflux condition in THF. Both the paramagnetic complexes have been characterized by FT-IR spectroscopy and elemental analyses. Solid-state structures of both the new complexes were established by single crystal X-ray diffraction analysis. In the molecular structures of complexes 1 and 2, each nickel(II) ion is six fold coordinated and form a distorted octahedral geometry. The optical properties of both complexes have been explored. The Hirshfeld surfaces are used to view and analyze the intermolecular contacts in crystalline state for complex 2.

We report the synthesis and structures of two octahedral nickel(II) complexes supported by imidazol-2-ylidene-N′-phenylureate ligand.

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Acknowledgements

This work is supported by the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), India (project no. SB/S1/IC/ 045/2013). The instrumental facilities were provided by the Indian Institute of Technology Hyderabad (IITH). K.N. thanks the University Grants Commission, India for his PhD fellowship.

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Correspondence to HARI PADA NAYEK or TARUN K PANDA.

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The FT-IR spectra of 1 and 2 are given in supplementary information available at www.ias.ac.in/chemsci.

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NAKTODE, K., KUNDU, A., SAHA, S. et al. Nickel(II) complexes having Imidazol-2-ylidene-N′-phenylurea ligand in the coordination sphere – syntheses and solid state structures. J Chem Sci 127, 1397–1404 (2015). https://doi.org/10.1007/s12039-015-0907-x

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