异三核过渡金属配合物〔Fe_2~Ⅲ M~ⅡO(OOCC_2H_5)_6L_3〕(M=Co,Ni,Mn;L=C_5 H_5N,H_2O)溶液行为的NMR和UV谱表征

在合成和表征了一系列新的异核异价三核过渡金属羧酸配合物〔Fe2 Ⅲ MⅡ O (OOCC2 H5 ) 6 L3〕 (M =Co ,Ni,Mn ;L =C5 H5 N ,H2 O)的基础上 ,利用多种NMR技术并结合UV谱研究了这些配合物在不同溶剂介质和温度下的谱学特征和动力学性质。利用谱峰积分比例、线宽、相同骨架分子的配体取代和纵向弛豫时间对1 HNMR谱进行了归属。实验结果表明 :这类配合物的金属离子间通过中心氧桥存在一定的反铁磁相互作用 ,从而在整体上削弱了顺磁性的影响 ,仍能观察到NMR谱。实验还发现这些配合物在CD3CN和DMSO溶剂中的结构与晶体结构一致 ,而在水中则分解为金属离子、羧酸盐和吡啶。这些结果有助于指导类似配合物的合成

NMR and UV Spectroscopic Characterization on the Solution Behavior of Heterotrinuclear Transition metal Complexes 〔Fe_2~ⅢM~ⅡO(OOC_2H_5)_6L_3〕 (M = Co,Ni, Mn; L = C_5H_5N,H_2O)

A series of new heterotrinuclear transition metal complexes 〔Fe 2 ⅢM ⅡO(OOCC 2H 5) 6L 3〕 (M = Co, Ni, Mn; L = C 5H 5N, H 2O) were synthesized and characterized. Their structures and dynamics in different solutions and temperatures were investigated by NMR and UV. Assignments of the 1H NMR spectra were made on the basis of relative intensities, broadening, substitution with appropriate ligands and spin lattice relaxation. Experimental results shows that there is antiferromagnetic exchange interaction among the three metal ions within M 3O core. It is found that these complexes in DMSO, CD 3CN, CDCl 3 and CD 3COCD 3 solvents are stable at room temperature and their structures in solution are the same as their crystal ones. However, the complexes decomposed into carboxylic acid, pyridin and metal ions in water. The results may be helpful in guiding synthesis of similar complexes.