Bistable photochromic organometallics based on linkage isomerization: Photochemistry of dicarbonyl(η 5-methylcyclopentadienyl) manganese(I) derivatives with a bifunctional, nonchelating ligand
Abstract
Cyclopentadienylmanganese complexes of the general formula (η 5-C 5H 4CH 3)Mn(CO) 2L, where L is a nonchelatable, bifunctional ligand, were found to be photochromic. Irradiation of (η 5-C 5H 4CH 3)Mn(CO) 2L(3-cyanomethylpyridme) with alternating visible and UV light produced alternating yellow and red solutions, and fatigue of this response was inhibited when free 3-(cyanomethyl)pyridine was present during irradiation. Similar results were observed when L is pyridine in the presence of dispersed acetonitrile. Irradiation of (η 5-C 5H 4CH 3)Mn(CO) 3 and a pyridine derivative RC 5H 4N (R = 3-CH 2CN, 2-CH 2CN, 4-CHCHPh, 4-CHCH 2) generated (η 5-C 5H 4CH 3)Mn(CO) 2L in situ, which likewise showed a photochromic response. The results demonstrate that the linkage isomerization occurs by unimolecular and bimolecular processes and that linkage isomerization is an effective photochromic mechanism for organometallics.
Publication Title
Organometallics
Recommended Citation
To, T., Barnes, C., & Burkey, T. (2004). Bistable photochromic organometallics based on linkage isomerization: Photochemistry of dicarbonyl(η 5-methylcyclopentadienyl) manganese(I) derivatives with a bifunctional, nonchelating ligand. Organometallics, 23 (11), 2708-2714. https://doi.org/10.1021/om0342356
