Synthesis and Structure of Isomeric Palladium(II)−Pyrazole Chelate Complexes with and without an N−H Group as Hydrogen Bond Donor
作者:Douglas B. Grotjahn、David Combs、Sang Van、Gerardo Aguirre、Fernando Ortega
DOI:10.1021/ic990995q
日期:2000.5.1
methyl)pyrazole]palladium(II) (2-PdCl2), which both feature an N-H group as a potential proton or hydrogen bond donor. For comparison, isomeric complexes lacking an NH group were prepared: dichloro[1-(diphenylphosphinomethyl)pyrazole]palladium(II) (3-PdCl2) and dichloro[1-(methylthiomethyl)pyrazole]palladium(II) (4-PdCl2). As determined by X-ray crystallography, all four complexes were found to have
制备了四个新的含有吡唑环和膦或硫醚的配体,并将其转化为顺式-二氯钯(II)配合物。配体中的两个特别值得注意,是侧链连接在吡唑碳上而不是在氮上。新的金属配合物包括二氯[3-(二苯基膦甲基)吡唑]钯(II)(1-PdCl2)和二氯[3-(甲硫基甲基吡唑)钯](II)(2-PdCl2),两者均具有NH基团。潜在的质子或氢键供体。为了比较,制备了缺少NH基团的异构体配合物:二氯[1-(二苯基膦基甲基)吡唑]钯(II)(3-PdCl2)和二氯[1-(甲基硫代甲基)吡唑]钯(II)(4-PdCl2)。通过X射线晶体学测定,发现所有四个络合物均具有稍微扭曲的正方形平面几何形状。含有NH基的配合物1-PdCl2和2-PdCl2既显示分子间氢键,又显示分子内氢键,而异构体3-PdCl2和4-PdCl2则不。报告了以下化合物的单晶X射线结构测定结果:1-PdCl2,空间群P1,a = 8.4488(9)A,b