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Syntheses, Structures and Properties of Two Luminous Mercury(II) Bromides Containing Tridentate N-Donor Schiff Bases: Control of Coordination Number and Nuclearity by Varying Ligand Matrices

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Abstract

Mononuclear [Hg(L1)Br2] (1) and 1D polymer [Hg2(L2)Br4]n (2) [L1 = (N,N-diethyl,N′-(pyridin-2-yl)formylidene)ethane-1,2-diamine and L2 = (N,N-diethyl,N′-(pyridin-2-yl)benzylidene)ethane-1,2-diamine] have been synthesized using appropriate molar ratios of HgBr2 and L1/L2 in methanol–acetonitrile solution mixtures at room temperature. Crystal structures were investigated with the help of single crystal X-ray diffraction data. In 1, the mercury(II) center adopts a distorted square pyramidal geometry bound by three N atoms of L1 and two terminal bromides. Compound 2 forms a 1D chain through Hg–Br–Hg bridges in an infinite fashion connecting two crystallographically independent mercury(II) centers; Hg1 is in a distorted square pyramidal environment coordinated by three N atoms of L2 and two bridging bromides, whereas Hg2 adopts a tetrahedral geometry bound by two terminal and two bridging bromides. 1 and 2 display intraligand 1(π−π*) fluorescence in DMF solutions at room temperature.

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Acknowledgments

BKG thanks the DST and CSIR, New Delhi, India for financial support. SS, SC, SD and KB are grateful to CSIR New Delhi, India for fellowships. The authors also acknowledge the use of DST-funded National Single Crystal X-ray Diffraction Facility at the Department of Inorganic Chemistry, IACS, Kolkata, India for crystallographic studies.

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Authors and Affiliations

  1. Department of Chemistry, The University of Burdwan, Burdwan, 713104, India

    Smita Satapathi, Somnath Choubey, Sumitra Das, Kishalay Bhar, Rajarshi Ghosh & Barindra Kumar Ghosh

  2. Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata, 700032, India

    Partha Mitra

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  1. Smita Satapathi
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  2. Somnath Choubey
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  3. Sumitra Das
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  5. Rajarshi Ghosh
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  6. Partha Mitra
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  7. Barindra Kumar Ghosh
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Correspondence to Barindra Kumar Ghosh.

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Satapathi, S., Choubey, S., Das, S. et al. Syntheses, Structures and Properties of Two Luminous Mercury(II) Bromides Containing Tridentate N-Donor Schiff Bases: Control of Coordination Number and Nuclearity by Varying Ligand Matrices. J Chem Crystallogr 42, 1060–1066 (2012). https://doi.org/10.1007/s10870-012-0359-9

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  • DOI: https://doi.org/10.1007/s10870-012-0359-9

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