Visible Photosensitization of trans-Styrylpyridine Coordinated to fac-[Re(CO)(dcbH)]: New Insights.

A strategic methodology has been developed to effectively synthesize the fac-[Re(CO)(dcbH)( trans-stpy)] complex, where dcbH = 2,2'-bipyridine-4,4'-dicarboxylic acid and trans-stpy = trans-4-styrylpyridine, which has been designed to efficiently absorb visible light. The complex exhibits outstanding trans-to- cis photoisomerization with 436 nm irradiation (Φ = 0.50 ± 0.

Photoreversible Molecular Motion of stpyCN Coordinated to fac-[Re(CO)(NN)] Complexes.

In this work, efficient trans ⇌ cis photoswitchings of 4-(4-cyano)styrylpyridine (stpyCN) coordinated to organometallic bipyridyl tricarbonyl rhenium(I) complexes, fac-[Re(CO)(NN)( trans-stpyCN)], where NN = 2,2'-bipyridine (bpy) or 4,4'-dimethyl-2,2'-bipyridine (dmb), are described. For both complexes, the true trans-to- cis quantum yields determined by H NMR spectroscopy are similar at 313, 334, and 365 nm irradiations (Φ ∼ 0.45), with a small decrease at 404 nm (Φ ∼ 0.