Structural features of catalytically active oligoorganometallosiloxanes

Article abstract of DOI:10.1007/BF02494491

Copper- and (copper,aluminum)-containing organosiloxanes were studied by spectroscopic methods. It was found that in organometallosiloxanes (OMS) with an increased content of copper (Si/Cu = 1 : 1), Cu atoms are rather uniformly distributed in the siloxane matrix. All compounds under study are complexes characterized by d - d-transitions in copper ions with a constant coordination number of the metal atom. The intensity of the d - d-transition band increases as the copper content increases. ESR studies demonstrated that in the compounds under consideration, a change from mononuclear paramagnetic centers to clusters, in which copper ions are linked by strong spin-exchange interactions, occurs as the copper content increases. The catalytic activity of the above-mentioned compounds in isomerization reactions of 3,4-dichlorobutene-1 was studied. It was found that copper atoms serve as catalytic centers.