New macrocyclic Cu(II)-bischelates with paddle wheel Cu2-acetate cage |
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Authors: | P Mosae Selvakumar PS Subramanian |
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Institution: | Analytical Science Division, Central Salt and Marine Chemicals Research Institute (CSIR), Bhavnagar 364 002, India |
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Abstract: | Two novel bolaamphiphile based dicarboxylic ligands L1H2 and L2H2 are synthesized by desymmetrizing aromatic anhydrides. The corresponding Cu(II) complexes Cu(L1) · EtOH]2 (1), Cu(L2) · (CH3CN)]2 (2) are synthesized and characterized. The crystal structure obtained for (1) and (2) indicates that they are new class of tetralactone type macrocyclic Cu(II) chelate complexes with paddle wheel Cu2-acetate cage structure. The 1:1, Cu(II) and ligand ratio leads into formation of a novel binuclear Cu(II) tetracarboxylate complexes. The macrocyclic chelate ring size in compounds 1 and 2 was altered from 15] membered to 19] membered by introducing phthalyl and diphenyl head groups as discussed in detail. The single crystal X-ray structure shows the Cu(II)?Cu(II) distance 2.613(13) Å for 1 and 2.626(13) Å for 2, the corresponding room temperature EPR spectra recorded for powdered polycrystalline samples indicate the existence of Cu(II)?Cu(II) dimeric system. |
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Keywords: | Diacids Copper(II)carboxylate Paddle wheel Macrocyclic chelate Self-assembly |
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