Abstract
The organometallic complex, fac-ClRe(CO)3(4,7-Ph2-phen), where 4,7-Ph2-phen is 4,7 diphenyl-1,10-phenanthroline, has been found to be luminescent and act as a spectroscopic probe in the polymerization of the aromatic cyanate ester monomer AroCy® L-10 and the related prepolymer AroCy® B-30. The photoluminescence arises from a low-lying metal-to-ligand charge transfer (MLCT) excited state in the metal complex, and this emission band is centred at 580 nm in methylene chloride solution at 298 K. When the complex is incorporated in the cyanate ester resin its emission band appears as a weak feature at 580 nm. Following thermal cure of the cyanate ester film the emission band of the complex becomes greatly intensified and it is shifted to 565 nm. The chemical and spectroscopic features of this rhenium complex facilitate its use as a luminescent probe in the visible region for monitoring the polymerization of cyanate ester materials.
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