CHAPTER 6: Metallosupramolecular Soft Materials: Metallogels
Published:13 Jul 2015
With the involvement of transition metal centres in the gel structures, metallogels have demonstrated unique and interesting properties, which could hardly be achieved by organic compounds alone. Over the years, highly phosphorescent, catalytic, magnetic and multi-stimuli-responsive metallogels have been reported. In addition, with the incorporation of d10 and d8 metal complexes, as exemplified by Au(i), Au(iii) and Pt(ii), metal–metal interactions have also been utilized to tune the gel properties. Drastic colour and emission changes are usually observed when there is formation or disruption of metal–metal interactions during sol–gel transitions upon the introduction of external stimuli. The drastic colour or emission changes are useful to report the subtle changes in the microenvironment and the packing of the gelator molecules, thus giving valuable information for the more rational design of gelators. The recent development of metallogels involving the use of transition metals is reviewed in this chapter. The special structural, spectroscopic and stimuli-responsive behaviour of the metallogels are highlighted.