Syntheses,solid state electronic and infrared spectra of the Ni(II), Pd(II) and Cu(II) complexes of N-(2-hydroxyethyl) and N-(3-hydroxypropyl) oxamide |
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| Institution: | 1. Department of Chemistry, of Sciences, Ferdowsi University of Mashhad, Mashhad 91775-1436, Iran;2. School of Chemistry, Damghan University, Damghan 36716-41167, Iran;3. Department of Biosystems, Faculty of New Technologies Engineering, Shahid Beheshti University, Tehran 19839-4716, Iran |
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| Abstract: | The new complexes K2Ni(Hheo)2], K2Cu(Hheo)2]·H2O, K2Ni(Hhpo)2]·H2O, K2M(Hhpo)2]·0.5H2O (M = Cu, Pd) and K2Cu2(hpo)2·0.5H2O, where H3heo = N-(2-hydroxyethyl)oxamide and H3hpo = N-(3-hydroxypropyl)oxamide, have been prepared. Several synthetic routes were investigated and the complexes were characterized by analyses, conductivity measurements, thermogravimetry, magnetic susceptibility and spectroscopy (i.r. and far i.r., diffuse reflectance u.v.). Monomeric square planar structures are found for the M(Hheo)2]2? and M(Hhpo)2]2? complex anions, while the hpo3? Cu(II) complex appears to be a square planar dimer. The doubly deprotonated Hheo2? and Hhpo2? ions exhibit a bidentate N(secondary amide), N′(tertiary amide)-coordination with the OH-group remaining uncoordinated, while the triply deprotonated hpo3? ion behaves as a bridging N(secondary amide), N′(tertiary amide), O(deprotonated) ligand, while two Cu(II) centres are bridged by two alkoxide-O atoms. The vibrational analysis of the dehydrated complexes is carried out, using NH/ND, OH/OD, 58Ni/62Ni and 63Cu/65Cu substitutions. |
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