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首页> 外文期刊>Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry >VO(IV), Fe(III), Co(II) AND Cd(II) COMPLEXES OF ASYMMETRIC SCHIFF BASE LIGANDS (N_2O_3). SYNTHESIS AND SPECTROSCOPIC STUDIES
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VO(IV), Fe(III), Co(II) AND Cd(II) COMPLEXES OF ASYMMETRIC SCHIFF BASE LIGANDS (N_2O_3). SYNTHESIS AND SPECTROSCOPIC STUDIES

机译:不对称席夫碱配体(N_2O_3)的VO(IV),Fe(III),Co(II)和Cd(II)配合物。合成与光谱学

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摘要

New series of mononuclear VO(IV), Co(II) and Cd(II) complexes of the formula (HLVO(OH_2)).nH_2O, (HLCo).xH_2O and (HLCd).xH_2O and binuclear Fe(III) complexes of the formula (LFe_2Cl_2(H_2O)_3)Cl.H_2O have been synthesized. L stands for one of the five asymmetrical pentadentate (N_2O_3) Schiff base ligands H_3L~1-H_3L~5 prepared by the condensation of acetoacetylphenol and ethylenediamine in the molar ratio 1:1 to prepare a half-unit Schiff base which is further condensed with one of the following aldehydes and ketones: o-hydroxyacetohpenone, salicylaldehyde, naphthaldehyde, benzoylacetone or acetylacetone. These ligands possess two dissimilar coordination sites, an inner, four-coordinating N_2O_2 donor set and an outer, three-coordinating O_2O set. The complexes were characterized by IR, electronic, ESR and mass spectra as well as conductivity and magnetic measurements. The magnetic moments of the VO(IV) complexes at room temperature are higher than expected for a single electron due to orbital contributions, while antiferromagnetic interaction is observed in the binuclear Fe(III) complexes due to interaction between two adjacent Fe(III) ions. The mass spectra of the complexes show base peaks with m/e values corresponding to the molecular weights of the complexes. The coordination numbers for the vanadium and iron ions are six with octahedral geometries and the coordination numbers for the cobalt and cadmium ions are four with tetrahedral geometries.
机译:分子式为(HLVO(OH_2).nH_2O,(HLCo).xH_2O和(HLCd).xH_2O的双核VO(IV),Co(II)和Cd(II)配合物的新系列合成了式(LFe_2Cl_2(H_2O)_3)Cl.H_2O。 L代表五个不对称五齿(N_2O_3)席夫碱配体H_3L〜1-H_3L〜5中的一种,该配体是通过将乙酰乙酰苯酚和乙二胺以1:1的摩尔比缩合制备的半单元席夫碱,然后与以下醛和酮之一:邻羟基乙酰庚酮,水杨醛,萘醛,苯甲酰基丙酮或乙酰丙酮。这些配体具有两个不同的配位点,一个内部的四配位的N_2O_2供体集和一个外部的三配位的O_2O集。通过IR,电子,ESR和质谱以及电导率和磁测量来表征该配合物。由于轨道的贡献,室温下VO(IV)配合物的磁矩高于单个电子的预期,而由于相邻的两个Fe(III)离子之间的相互作用,在双核Fe(III)配合物中观察到反铁磁相互作用。 。配合物的质谱显示出具有对应于配合物分子量的m / e值的基峰。钒和铁离子的配位数为六面体,八面体;钴和镉离子的配位数为四面体,四面体。

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