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.
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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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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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DOI: https://doi.org/10.1007/s12039-015-0907-x