Photochromic Transitional Metal Complexes for Photosensitization

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)12_Chapter in an edited book (Author)peer-review

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Original languageEnglish
Title of host publicationPhotochromic Materials
Subtitle of host publicationPreparation, Properties and Applications
Editors He Tian, Junji Zhang
Place of PublicationGermany
ISBN (Print)9783527683734, 9783527337798
Publication statusPublished - 15 Jun 2016

Publication series

NamePhotochromic Materials: Preparation, Properties and Applications


Photochemical reactions of most organic compounds occur predominantly at the lowest-lying singlet excited state. This is attributed to the very inefficient intersystem crossing (ISC) from the singlet to the triplet state due to its spin-forbidden nature. In the organic photochromic systems, even though the photochromism is originated from different reaction mechanisms such as reversible trans-cis photoisomerizations as well as the reversible photoinduced ring-opening and ring-closing reactions, most of these reactions are derived from the excited singlet state. Studies on the photochromic reactivity of azo compounds, stilbenes, spiropyrans, and spirooxazines via the triplet excited-state pathway achieved by intermolecular photosensitization with organic photosen-sitizers have also been reported in the literature. Along with the rapid development of phosphorescent metal polypyridine complexes in the 1970s, diffusion-controlled intermolecular sensitization of photochromic reactions of stilbenes with the triplet excited state of tris (bipyridyl) ruthenium(II) and tricarbonyl rhenium(I) bipyridine complexes has been demonstrated.

Research Area(s)

  • Azo compounds, Intersystem crossing, Organic photochromic systems, Phosphorescent metal polypyridine complex, Photoisomerizations, Spirooxazines, Spiropyrans, Stilbenes, Tricarbonyl rhenium(I) bipyridine complex, Tris (bipyridyl) ruthenium(II) complex

Citation Format(s)

Photochromic Transitional Metal Complexes for Photosensitization. / Ko, Chi-Chiu; Yam, Vivian.

Photochromic Materials: Preparation, Properties and Applications. ed. / He Tian; Junji Zhang. Germany : Wiley, 2016. p. 47-70 (Photochromic Materials: Preparation, Properties and Applications).

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)12_Chapter in an edited book (Author)peer-review