Photochromic metal complexes

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... 

Table 1 New functions developed in photochromic metal complexes ...

Fernandez-Acebes, A. and Lehn, J.M., Optical switching and fluorescence modulation properties of photochromic metal complexes derived from dithienylethene ligands, Chem.-Eur. J., 5, 3285, 1999. 

Thin films of photochromic silver complex oxides were prepared by anodic oxidation of silver metal films (15). Complex oxides, such as Ag2V04, Ag SiO, and Ag2P04, darkened by exposure to visible light, but required heating to 150—250°C for thermal bleaching. 

Silver was one of several metals found to give a photochromic primary complex. In THF it was normally yellow (Ama = 470 nm). Activation at 450 nm, i.e. in the region containing the normal visible absorption band, generated a violet solution with in the 570-620 nm... 

Aniline, A -(salicvlaldehydo)-photochromism, 718 Aniline, TV-sulfinyl-metal complexes, 804 Anils... 

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... 

Keywords Metal complex Multi-mode function Photochromism... 

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

Fig. 1 Concept of photochromic molecule-bound metal complexes...

Photochromic transition metal complexes derived from photoisomerization represents another important branch of photofunctional materials. Sev-... 

With the purpose of further increasing the number of adjustable photochromic parameters of the subunit, a binuclear metal complexe of porphyrazine bearing six bis(trimethylthiophenyl) functionalities at the periphery was synthesized in our laboratory [40] (Scheme 12). The structure of binuclear porphyrazine was rigidly constrained in a coplanar arrangement with extended n-conjugated subunits. 

Three major topics have dominated research activity on thiophenes since 1996 the design and synthesis of dithienylethene molecules for application as photochromic systems (Section 3.10.2.1.3) reactions brought about under transition metal catalysis (Section 3.10.2.11) and the synthesis, characterization, and reactivity of a plethora of transition metal complexes of thiophenes (Section 3.10.6). All three had received brief mention in CHEC-11(1996) (Sections 2.10.2.2.3, 2.10.4.7.3, and 2.10.6, respectively), but together account for almost one-third of the chapter now. In addition, shorter sections have been introduced to cover the following topics one-electron oxidation of thiophenes (Section 3.10.2.2) electrochemical reactions at cathodes (Section 3.10.2.7.5) sulfur-extrusion and sulfur-transfer reactions (Section 3.10.2.10) and reactivity of silicon-linked substituents (Section 3.10.4.5). 

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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