Polymeric complexes from molybdenum trioxide, with notes on derivatives and related compounds

Publisher Website
Google Scholar
Abstract
Molybdenum trioxide dissolves in dimethyl sulphoxide (dmso) to give a solution from which the polymeric complex [{MoO3(dmso)1.33}n](1a) may be crystallised. It also reacts with pyridine N-oxide (pyo), triphenylarsine oxide, and pyridine (py) to give insoluble polymeric complexes [{MoO3(pyo)}n](2), [{MoO3(AsPh3O)0.5}n](3), and [{MoO3(py)}n](4). The solubility of (1a) enables its conversion to (2), (3), or (4). Another compound, [{MoO3(AsPh3O)}n](5) has been obtained from the MoVI acetylacetonate complex [MoO2(acac)2]. Evidence on the constitution of the insoluble compounds comes from i.r. spectra and X-ray diffractograms, with the ‘white’ and ‘yellow’ molybdic acids, [{MoO3(OH2)}n] and [{MoO3(OH2)}n]·nH2O respectively, providing reference structures. The molybdenum co-ordination environment comprises the ligand opposite a single terminal oxygen, along with four bridging atoms, as in the yellow form of the acid. The formation of these compounds is considered in relation to the simpler Mo–O–Mo bridge-cleavage reaction shown by the ‘digol’ compound [{MoO2(deg)}n](H2deg = diethylene glycol), to give complexes of the type [MoO2(deg)L]. Solutions of (1a) react with hydroxylic compounds in the presence of triethoxymethane as condensing agent. Products obtained from 2-amino-2-methylpropane-1,3-diol and 2-hydroxymethy1-2-methylpropane-1,3-diol are reported.

This publication has 0 references indexed in Scilit: