TITLE: Heterobimetallic Complexes for CO Reduction. Annual Progress Report, October 1, 1985-July 31, 1986.

AUTHOR: J. K. Stille.

INST.  AUTHOR: Colorado State Univ., Fort Collins.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  1 Aug 86,  10p.

NTIS ORDER NO.: DE86014790/INW

ABSTRACT:

Complexes containing combinations of early (Nb, Mo, W) and late (Fe, Co, Rh) transition metals that could be expected to activate carbon monoxide most effectively are primary targets. The late transition metals were selected because they are the most efficient in heterogeneous catalysts used in Fischer-Tropsch and other carbon monoxide reductions. As models for reactions occurring in the reduction of CO, some key reactions of certain dinuclear palladium complexes have been observed. The reaction of a homodinuclear palladium complex containing hydride and methyl on adjacent palladiums with CO gives the acyl complex which eliminates acetaldehyde. The palladium complex containing a hydride bridge and methyls on each palladium intramolecularly eliminates methane and ethane. Its insertion reaction with CO occurs stepwise to yield a diacyl complex that eliminates acetaldehyde. One approach to the generation of a complex containing methyl on iron and hydride on tungsten is the reduction of the dinuclear complex ((CO)/sub n/CpWPPh sub 2 -C sub 5 H sub 4 Fe(CO) sub 2 CH sub 3 ) sup +, which is being carried out with various hydride sources. The synthesis of various dinuclear complexes containing niobium hydride and rhenium carbonyl are under study. A complex containing niobium (IV) chloride and rhenium (I) tricarbonyl held together by a fulvene bridging ligand has been prepared. (ERA citation 11:051502)

REPORT  NUMBER: DOE/ER/13340-2

CONTRACT  NUMBER: FG02-85ER13340