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Synthesis, molecular structures and ESI-mass studies of copper(I) complexes with ligands incorporating N, S and P donor atoms

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Abstract

Equimolar reaction of copper(I) bromide with 2-thiouracil (tucH2) in acetonitrile-methanol formed a light yellow solid which on subsequent treatment with a mole of triphenyl phosphine (PPh3) in chloroform has yielded a sulfur-bridged dinuclear complex, [Cu2Br2(μ-S-tucH2)2(PPh3)2] ⋅2CHCl3 1. A reaction of copper(I) bromide with two moles of 2,4-dithiouracil (dtucH2) in acetonitrile-methanol followed by addition of two moles of PPh3, designed to form [Cu(μ-S,S-dtuc)2(PPh3)4Cu] 2a, instead resulted in the formation of previously reported polymer, {CuBr(μ-S,S-dtucH2)(PPh3)}n 2. Reaction of copper(I) iodide with 2-thiouracil (tucH2) and PPh3 in 1:1:2 molar ratio (Cu:H2tuc:PPh3) as well as that of copper(I) thiocyanate with pyridine-2-thione (pySH) or pyrimidine-2-thione (pymSH) and PPh3 in similar ratio, yielded an iodo-bridged unsymmetrical dimer, [(PPh3)2(μ-I)2Cu(PPh3)] 3 and thiocyanate bridged symmetrical dimer, [(PPh3)2Cu(μ-N,S- SCN)2Cu(PPh3)2] 4, respectively. In both the latter reactions, thio-ligands which initially bind to Cu metal center, are de-ligated by PPh3 ligand. Crystal data: 1, P21/c: 173(2) K, monoclinic, a, 13.4900(6); b, 17.1639(5); c, 12.1860(5) Å; β, 111.807(5) ∘; R, 5.10%; 2, Pbca: 296(2) K, orthorhombic, a, 10.859(3); b, 17.718(4); c, 23.713(6) Å; α=β=γ, 90 ∘; R, 4.60%; 3, P21: 173(2) K, monoclinic, a, 10.4208(7); b, 20.6402(12); c, 11.7260(7) Å; β, 105.601(7)∘; R, 3.97%; 4, P-1: 173(2) K, triclinic, a, 10.2035(4); b, 13.0192(5); c, 13.3586(6) Å; α, 114.856(4); β, 92.872(4)∘; γ, 100.720(4)∘; R, 3.71%. ESI-mass studies reveal different fragments of complexes.

Sulfur-bridged dimer [Cu2Br2(μ-S-tucH2)2(PPh3)2]·2CHCl3 1 is the first example of a dinuclear complex of 2-thiouracil/ 2,4-dithiouracil class of ligands.

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Acknowledgements

Financial assistance in the form of Emeritus Scientist Grant [21(0904)/12-EMR-II] to T.S. Lobana, from the Council of Scientific and Industrial Research (CSIR), New Delhi, and grant from the Department of Science and Technology (DST) for X-ray diffractometer to Department of Chemistry, GNDU, Amritsar are gratefully acknowledged. JPJ acknowledges the NSF-MRI program (Grant No. CHE-1039027) for funds to purchase the X-ray diffractometer.

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Authors and Affiliations

  1. Department of Chemistry, Guru Nanak Dev University, Amritsar, 143 005, India

    TARLOK S LOBANA, ARVINDER KAUR, ROHIT SHARMA, MADHU BALA & AMANPREET K JASSAL

  2. Department of Chemistry, Keene State College, Keene, NH, 03435–2001, USA

    COURTNEY E DUFF & JERRY P JASINSKI

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  1. TARLOK S LOBANA
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Correspondence to TARLOK S LOBANA.

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Supplementary Information

Crystallographic data (excluding structure factors) for the structures in this paper have been deposited with the Cambridge Crystallographic Data Centre, CCDC, 12 Union Road, Cambridge CB21EZ, UK. Copies of the data can be obtained free of charge on quoting the depository numbers CCDC 1405753 for 1, 1405754 for 2, 1405755 for 3 and 1405756 for 4 (Fax: +44-1223-336-033; E-Mail: deposit@ccdc.cam.ac.uk, http://www.ccdc.cam.ac.uk). ESI mass data area in Supplementary Information is available at www.ias.ac.in/chemsci.

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LOBANA, T.S., KAUR, A., SHARMA, R. et al. Synthesis, molecular structures and ESI-mass studies of copper(I) complexes with ligands incorporating N, S and P donor atoms. J Chem Sci 127, 1859–1869 (2015). https://doi.org/10.1007/s12039-015-0953-4

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