Photochromic ligands

Phosphorus-containing macrocycles, 990, 996, 998 macrocychc effect, 1002 ring size, 1003 stereochemistry, 1003 Phosphorus heterocycles transition metal complexes, 1041 Phosphorus ligands, 989-1061 ir-acid series, 1033 bonding, 1030-1041 cone angle concept, 1012 trigonal bipyramidal complexes, 1036 Phosphorus oxychloride metal complexes, 500 Phosphorus ylides transition metal complexes, 1056 Phosphorylation biological, 978 Phosvitin, 975 Photochromism... 

Belser, P., De Cola, L., Hard, F., et al., Photochromic switches incorporated in bridging ligands A new tool to modulate energy-transfer processes. Advanced Functional Materials 2006, 16, 195-208. 

In the present article, we provide an overview of the studies dealing with metal complexes with photochromic ligands. It should be noted that there are certain photochromic metal complexes that show their photochromism... 

Interest in metal complexes with photochromic ligand(s) Is twofold. 

Tian et al. have reported that bis(5-pyridyl-2-methylthien-3-yl)cyclopen-tene ligand 42 shows enhancement of photochromism by complexation with a Zn2+ ion [35]. They also found that the fluorescent properties, including the intensity and emission peak wavelengths of the compound, can be reversibly regulated by UV-vis light, Zn2+, and protons [36]. 

Photochromic trans- d.v-isomerization and molecular switching properties of azo-conjugated metal complexes with heterocycles as ligands 04BCJ407. 

In this chapter, crystalline-state photochromic dynamics of rhodium dithionite complexes are reviewed. The chemistries described here have been achieved not only by recent developments of the analytical technique but also by discovery of a new class of transition-metal based photochromic compounds. One of the advantages of transition-metal complexes is structural diversity. In order to find the rule of an exquisite combination of metal ions and ligands, we are currently synthesizing various dithionite derivatives with other metal ions and/or modified Cp ligands. As shown in this chapter, dithionite complexes are a very useful photochromic system to investigate crystalline-state reaction dynamics. We believe that dynamics studies of newly synthesized dithionite derivatives provide useful insight into the construction of sophisticated molecular switches. A dithionite complex may appear in a practical application field in the near future. 

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