Abstract
Three new scorpionate nickel complexes [Tp*Ni(Hglu)(H2O)]·EtOH (1), Tp*Ni(Haze)(MeOH) (2), and Tp*Ni(HTA)(H2O) (3) (Tp* = hydrotris(3,5-dimethylpyrazolyl)borate) with different spanning dicarboxylo co-ligands (H2glu = glutaric acid, H2aze = azelaic acid, H2TA = tetradecane diacid) were synthesized by solution methods at room temperature. X-ray crystallographic analyses of complexes 1–3 demonstrate that these three octahedral Ni scorpionate complexes each contain an anionic chelating dicarboxylic acid, O2C(CH2) n COOH, n = 3, 7, and 12, respectively. The sixth coordination site is occupied by an ethanol, methanol, or water that is hydrogen bonded to the terminal carboxylic acid end of the anionic dicarboxylic acid ligand from a different Tp*Ni complex in the crystal lattice. Through these abundant hydrogen bond interactions, complexes 1 and 2 form 2D hydrogen bonding network structures, respectively, while complex 3 has a 1D infinite double-chain structure. The results of quantum mechanical calculations and thermogravimetric analyses on these complexes are presented and discussed.
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