An efficient method was developed for the preparation of a series of zinc Schiff base complexes. Introduction of a pyridyl group as a bridging unit as well as incorporation of ethynyl and electron-donating groups into the salicylidene moiety of these complexes moderately enhances the photoluminescence intensity and quantum yield. Electron-rich palladium groups possibly influence the photophysical character through the bridging C[triple bond]C bond. The crystal structure of the pyridine adduct of a salen Zn complex is determined by X-ray diffraction analysis.

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The reaction of the (α-alkoxyfuryl)ruthenium complexes 4 with oxygen opens the five-membered furyl ring to give the addition product [Ru]O 2 CCR=CHCO 2 CH 3 , (5, [Ru] = Cp(PPh 3 ) 2 Ru). Further reactions of 5 with CH 3 I and with organic acid gave CH 3 O 2 CCR=CHCO 2 CH 3 , (6), and HO 2 CCR=CHCO 2 CH 3 , (7), respectively. The reaction of 4 with TMSN 3 [TMS = (CH 3 ) 3 Si] gives the ruthenium azide [Ru]-N 3 and α-alkoxyfuran, which is readily hydrolyzed to lactone in acidic medium. Treatment of the cyclopropenylru-