Abstract
Three novel pyrazole-dicarboxylate acid derivatives namely 1-(carboxymethyl)-5-methyl-1H-pyrazole-3-carboxylic acid [L1], 1-[(3-carboxy-5-methyl-1H-pyrazol-1-yl) methyl]-5-methyl-1H-pyrazole-3-carboxylic acid [L2] and 1-[3-(3-carboxy-5-methyl-1H-pyrazol-1-yl) propyl]-5-methyl-1H-pyrazole-3-carboxylic acid [L3] were synthesized and characterized by 1H NMR and ESI-MS. The coordination/chelation and crystallization property of these organic molecules with CuII/CoII/ZnII were studied and single crystals were obtained with L1 and L3 on reaction with Cu(NO3)2 and Co(NO3)2, respectively. Single crystal X-ray diffraction experiments revealed that both resulted in mononuclear chelate complexes of formula [Cu(L1)2(H2O)]·2H2O (A) and [Co(L3)(H2O)2] (B). A and B consist of 2D hydrogen bonded networks with and without lattice included water molecules, respectively. The crystal structure of the free derivative L2 is also presented.
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