Tsutomu Mizuta, A. Okano, Tsutomu Sasaki
Jan 15, 1997
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26
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Journal
Inorganic Chemistry
Abstract
Palladium(II) and platinum(II) complexes with 1,4,8,11-tetramethyl-1,4,8,11-tetraphosphacyclotetradecane were prepared by a template reaction in which [M(MeHPCH2CH2PHMe)2]Cl2 (M = Pd, Pt) reacts with 1,3-dibromopropane in the presence of K2HPO4 as a base. The bromide salts of the Pd2+(6a) and Pt2+(6b) complexes were isolated as crystals in a low yield. Their molecular structures were determined by X-ray crystallography. Both compounds have a square-planar geometry in which the configurations of the four asymmetric phosphorus atoms are of the trans III (RRSS) type. The M−P bond distances for 6a and 6b are 2.268(1) and 2.277(2) A, respectively, which are slightly smaller than those of the complexes with noncyclic phosphines. Crystallographic data for 6a: monoclinic, space group C2/m, a = 8.4856(7) A, b = 17.273(1) A, c = 9.5712(7) A, β = 101.117(7)°, V = 1376.5(2) A3, Z = 2, and R = 0.042. Crystallographic data for 6b: triclinic, space group P1, a = 9.538(3) A, b = 9.781(2) A, c = 8.719(1) A, α = 115.34(...