Oxomolybdenum(VI) and (IV) complexes of pyrazole derived ONO donor ligands – synthesis, crystal structure studies and spectroelectrochemical correlation
作者:Samik Gupta、Anil Kumar Barik、Sachindranath Pal、Arijit Hazra、Somnath Roy、Ray J. Butcher、Susanta Kumar Kar
DOI:10.1016/j.poly.2006.08.001
日期:2007.1
cis-dioxomolybdenum complexes of general formula [MoO2(Ln)EtOH] (n = 1–4) and one oxomolybdenum(IV) complex [MoO(L4)EtOH], with potentially tridentate Schiff bases derived from 5-methyl pyrazole-3-carbohydrazide and salicylaldehyde/substituted salicylaldehyde/o-hydroxy acetophenone have been prepared. The Mo(IV) complex is derived from the Mo(VI) dioxo complex by oxotransfer reaction with PPh3. The complexes are characterized
四种通式[MoO 2(L n)EtOH](n = 1-4)的顺式-二氧钼钼配合物和一种氧钼(IV)络合物[MoO(L 4)EtOH],潜在的三齿席夫碱衍生自5-甲基制备了吡唑-3-碳酰肼和水杨醛/取代的水杨醛/邻羟基苯乙酮。Mo(IV)配合物是通过与PPh 3的羰基转移反应从Mo(VI)二氧杂配合物衍生而来的。配合物的特征在于元素分析,电子光谱,IR,11 H NMR,和通过循环伏安法。所有的Mo(VI)物种都具有晶体学特征。配合物具有扭曲的八面体结构,其中配体表现为二元供体,而吡唑-N则不与金属中心配位。从晶体结构还可以看出,Mo(VI)中心享有NO 5供体环境。