A complete series of W_2(hpp)_4Cl_n (n = 0, 1,2) componds

摘要

Full structural characterization of the first homologous series of ditungsten paddlewheel compounds having an electronic configuration of the type sigma~2pi~4delta~x, x = 2,1,0, and W-W bond orders of 4,3.5 and 3, respectively, has been accomplished with the guanidinate-type ligand hpp (hpp = the anion of 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine); the lengthening in bond distances from W_2(hpp)_4·2NaHBEt_3 to W_2(hpp)_4Cl to W_2(hpp)_4Cl_2 is 0.05A for each step.