Chemosensors photoluminescent

In principle, optical chemosensors make use of optical techniques to provide analytical information. The most extensively exploited techniques in this regard are optical absorption and photoluminescence. Moreover, sensors based on surface plasmon resonance (SPR) and surface enhanced Raman scattering (SERS) have recently been devised. 

Table 2 Structural formulas of analytes and functional monomers, accompanied by characteristic values of merit, used in the photoluminescent MIP chemosensors... 

The incorporation of siloles in polymers is of interest and importance in chemistry and functionalities. Some optoelectronic properties, impossible to obtain in silole small molecules, may be realized with silole-containing polymers (SCPs). The first synthesis of SCPs was reported in 1992.21 Since then, different types of SCPs, such as main chain type 7r-conjugated SCPs catenated through the aromatic carbon of a silole, main chain type cr-conjugated SCPs catenated through the silicon atom of a silole, SCPs with silole pendants, and hyperbranched or dendritic SCPs (Fig. 2), have been synthesized.10 In this chapter, the functionalities of SCPs, such as band gap, photoluminescence, electroluminescence, bulk-heterojunction solar cells, field effect transistors, aggregation-induced emission, chemosensors, conductivity, and optical limiting, are summarized. 

For chemosensor electronic nose applications, it is useful to have sensors with varied responses. The 12 different luminescent polymers (9-12 are germole copolymers) examined [41] exhibit a different ratio of the photoluminescence quenching for picric acid, TNT, DNT, and nitrobenzene and a different response with the same analyte, as shown in Figure 8. 

Figure 3 Cyclodextrin-derived, Tb-binding chemosensor (a) by the Nocera group, along with its photoluminescence in the presence of various amounts of naphthalene (b). (Reproduced with permission from Ref. 35. American Chemical Society, 1996.)...

---