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Construction of diverse supramolecular assemblies of dimetal subunits differing in coordinated water molecules via strong hydrogen bonding interactions: Synthesis, crystal structures and spectroscopic properties

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Abstract

Three new supramolecular assemblies (constructed through strong hydrogen bonding) of \([\text {Co}_{\mathrm {2}}\text {(bpta)}_{\mathrm {2}}\text {(adc)}(\mathrm {H}_{\mathrm {2}}\mathrm {O})_{\mathrm {4}}](\text {ClO}_{\mathrm {4}})_{\mathrm {2}}^{\mathbf {.}}\mathrm {2H}_{\mathrm {2}}\mathrm {O}\) (1), [ Cu2(bpta)2(fum)(H2O)2](ClO4)2 (2) and [Cu2(bpta)2(tdc)(H2O) (ClO4)](ClO4).3H2O (3), which are synthesised by one pot self-assembly of the metal salt, bpta ligand and the corresponding dicarboxylate under the same reaction conditions, are reported (where adc = acetylene dicarboxylate, fum = fumarate, tdc = 2,5-thiophenedicarboxylate and bpta =N,N′-bis(2-pyridylmethyl)-tert-butylamine). These compounds have varying degrees of coordinated water molecules per dimetal subunits (four for 1, two for 2 and one for 3, respectively). Furthermore, the orientation of the coordinated water molecules in 1 and 2, with respect to the mono (carboxylato)-bridged dimetal subunit, is different (cis and trans, respectively). On the other hand, there is a coordinated perchlorate ion in 3 making the two metal centers inequivalent. Unlike 1 and 3, there are no lattice water molecules in 2. This difference in the dimetal subunit in 1–3 and the presence or absence of the lattice water molecules are the keys to forming the diverse supramolecular assemblies. In 1 and 3, the involvement of lattice water molecules in the construction of such assemblies is distinctly different. In case of 2, the formation of supramolecular assembly depends on the coordinated water molecule (trans to each other) and thus a ladder shaped supramolecular assembly is the result. The strength of hydrogen bonding observed in the networks of 1–3 is indicated in the O· · ·O distances (2.596 Å to 3.160 Å) and the O-H...O angles 124∘ to 176∘. All are characterised by elemental analysis, FTIR spectroscopy and single crystal X-ray diffraction studies.

Diverse supramolecular assemblies with varying degree of coordinated water molecules per dimetal subunits of Co(II) or Cu(II) (four for 1, two for 2 and one for 3, respectively)comprised of a flexible tridentate ligand and dicarboxylate linkers are reported.

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Acknowledgements

Funding for this work was provided by IISER, Mohali. S. K. is grateful to CSIR, India for research fellowship. The use of X-ray and NMR facilities at IISER, Mohali, and CIL, NIPER, Mohali for CHN analysis are gratefully acknowledged. We thank one of the referees for helpful suggestions.

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Authors and Affiliations

  1. Department of Chemical Sciences, Indian Institute of Science Education and Research, Mohali, Sector 81, Manauli PO, S.A.S. Nagar, Mohali, (Punjab), 140 306, India

    SADHIKA KHULLAR & SANJAY K MANDAL

  2. Department of Chemistry, DAV University, Jalandhar, Punjab, 144 001, India

    SADHIKA KHULLAR

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  1. SADHIKA KHULLAR
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Correspondence to SANJAY K MANDAL.

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Supplementary Information

Crystallographic data of the structures 1–3 in CIF format (CCDC 1000552-1000554, respectively). Copies of the data can be obtained, free of charge, on application to CCDC, 12 Union Road, Cambridge CB2 1EZ, UK, (fax: + 44-(0)1223-336033 or e-mail: deposit@ccdc.cam.ac.uk)

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KHULLAR, S., MANDAL, S.K. Construction of diverse supramolecular assemblies of dimetal subunits differing in coordinated water molecules via strong hydrogen bonding interactions: Synthesis, crystal structures and spectroscopic properties. J Chem Sci 126, 1515–1523 (2014). https://doi.org/10.1007/s12039-014-0685-x

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  • DOI: https://doi.org/10.1007/s12039-014-0685-x

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