Capture of aromatic carboxylate anion through second sphere coordination: Topological complementarity of [cis-Co(en)2(N3)2] and ions |
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| Authors: | Rajni Sharma, Raj Pal Sharma, Paloth Venugopalan, Miguel Quir s, Juan M. Salas, J. Yu,Y. Du |
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| Affiliation: | aDepartment of Chemistry, Panjab University, Chandigarh 160014, India;bDepartamento de Quı´mica Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain;cState Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China |
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| Abstract: | [cis-Co(en)2(N3)2]C7H3ClNO4·1.25H2O (Cocnb) was synthesised and detailed packing analyses were undertaken to delineate the topological complementarity of [cis-Co(en)2(N3)2]+ and a 2-chloro-4-nitro benzoate anion (cnb) for second sphere coordination in the crystal lattice. The complex was completely characterised by elemental analyses, spectroscopic studies (IR, UV/visible, 1H and 13C NMR). The compound crystallizes in the monoclinic (space group C2/c) with a = 21.9843(18), b = 8.7959(7), c = 23.0121(18) Å, β = 116.426(1)°, V = 3984.9(6) Å3, and Z = 8. In the crystal lattice, discrete ions of [cis-Co(en)2(N3)2]+ and cnb are arranged in  A–B–A–B pattern (in both a and c directions of the lattice) forming columns of anions and cations. The anionic columns are π stacked and are involved in extensive hydrogen bonding interaction. It appears that the topological feature of [cis-Co(en)2(N3)2]+ is conducive for generating second sphere interactions with aromatic carboxylates. This strategy may be used as a viable method for the capture of aromatic carboxylate anions. |
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| Keywords: | Cobalt(III) Coordination chemistry 2-Chloro-4-nitrobenzoate Second sphere coordination Supramolecular chemistry X-ray crystallography |
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