Photo-properties

Many of the organometallic polymers are semiconductors with bulk resistivities in the range of 10 —10 ° O-cm suitable for specific semiconductor use. Further, some exhibit interesting photo properties. 

Photo-properties op Anils in Solution in Rigid Glasses We have discovered that all anils of salicylaldehyde and of substituted salieylaldehydes are photo-colourable in solution in rigid glasses, whether or not they are so colourable in the crystalline state. The spectral changes involved appear to be identical for crystal and glassy solution. This proved true for a variety of solvents, both polar and non-polar, over wide ranges of temperature (—185° to —50°C) and concentration (5 x 10-8 to 1Q 8M)... 

Covalent, stoichiometric [dendrimer core fullerene shell] nanocompotmds were readily formed by allowing a [core l,2-diaminoethane] (4 2) dendri-poly (amidoamine)-(NH2)64 (G = 4) PAMAM dendrimer to react with an excess of buckminsterfullerene (Ceo) [177]. In the presence of an excess of C o, only 30 Ceo moieties bonded to the dendrimer surface to produce a well-defined, stoichiometric [dendrimer (core) fuUerene (shell) ] nanocompotmd, i.e., [S-l (H-5)3o] core-shell-type as shown in Fig. 27. These structures were characterized extensively by MALDI-TOF, thermogravimetric analysis (TGA), UV-vis spectroscopy, and Fourier transform infirared (FTIR) spectroscopy. Such nanocompounds exhibited new fullerene-like solubility and photo-properties by readily generating singlet 02 in either aqueous or organic solvents. However, they offered other unique features such as larger size and nanocontainer-type properties that would normally be associated with the dendrimer core interior. 

In Chapter 13 we shall introduce a short section on some photo properties of polymers that are governed by phenomena similar to the behaviour presented above. The photo characteristics of polymers are becoming very important as they are the basis of the growing technology of organic light emitting diodes (OLEDs), which may very well displace liquid crystal displays in computers in the next few years. Here we concentrate on ... 

Kurokawa Y., Kobayashi Y., Nakata S. Preparation of Iransparent alumina films by the sol-gel process and ist application to photo-functional films. Heterogeneous Chem. Rev. 19 1 309-328 Kurokawa Y., Ishizaka T., Ikoma T, Tero-Kubota S. Photo-properties of rare earth ion (Er +, Eu + and Sm +)-doped alumina films prepared by the sol-gel method. Chem. Phys. Lett. 1998 287 737-741... 

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