Synthesis of nonanuclear heterometallic carbide clusters. Unexpected formation of the [Ru-6(CO)(16)](2-)[Pt-2(CO)(2)(dppm)(2)](2+) ion pair on the way to [Ru6C(CO)(16)Pt-3(dppm)(2)]

摘要

A novel trimetallic cluster [Ru5CRh2Pt2(CO)(16)(dppm)(2)] (3) was synthesized via coupling of two neutral clusters-[Ru5C(CO)(15)] and [Rh2Pt2(CO)(6)(dppm)(2)]. The structure of this mixed metal complex was established using X-ray crystallography and P-31 NMR spectroscopy. It was found that the reaction between [Ru6C(CO)(17)] and [Pt-2(CO)(3)(dppm)(2)] leads to spontaneous electron transfer between these polynuclear complexes and results in the formation of an unusually stable cluster "salt" {[Ru-6(CO)(16)](2-) [Pt-2(CO)(2)(dppm)(2)](2+)} (1), which was characterized by crystallographic and spectroscopic methods. Heating of the Ru-6-Pt-2 ion pair in an autoclave (145 degrees C, 15 atm N-2) results in fusion of the metal frameworks to give a nonanuclear mixed metal [Ru6C(CO)(16)Pt-3(dppm)(2)] cluster in a good yield. The latter complex was obtained earlier as a minor product of another thermal reaction and now has been additionally characterized by P-31 NMR spectroscopy.