Add time:07/26/2019         Source:sciencedirect.com

Complexes of type ML2, ML2(H2O)2 and ML2(py)2 (LH = pyrazole-4,5-dione-4-oximes) have been prepared and their IR and LSIMS spectra, magnetic susceptibilities and behaviour towards triphenylphosphine and dimethyl acetylenedicarboxylate (DMAD) have been investigated. The structures of Zn(Mpo)2(H2O)2 (MpoH = 1,3-dimethyl-1 H-pyrazole-4,5-dione-4-oxime and Mn(1-Ppo)2(py)2 (1-PpoH = 3-methyl-1-phenyl-1 H-pyrazole-4,5-dione-4-oxime) were determined by X-ray crystallography. In all the complexes, the ligands chelate to the metal, forming six-membered rings. The adducts are monomeric, whereas the ML2 complexes are associated in the solid state. All the complexes and their respective ligands react with DMAD at 80°C to give the condensation product, whereas at 20°C, the ligands and their lithium complex give the open chain adduct.

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