| In this dissertation, photophysics of a series of platinum acetylides with strong electron acceptor units were studied. We found that all the oligomers showed strong absorption in the visible region and emission from visible to NIR region of the spectrum. In order to determine the energy of charge transfer (CT) state, electrochemical experiments were conducted and we found out that CT state is below the first triplet excited state.;Second, a series of platinum complexes in which the platinum is directly attached to various oligothiophene and charge-transfer chronophers, were synthesized and characterized. Photophysical and electrochemical properties was investigated and compared to those in which metal is attached to the ring system via acetylene linker. Complexes with oligothiophenes showed strong triplet-triplet absorption, and relatively good singlet oxygen quantum yields suggesting that complexes promotes triplet state formation upon excitation, on the other hand, relative intensity of triplet-triplet absorption and singlet oxygen quantum yield was lower than those complexes with acetylene linkage. One of the important properties of synthesized complexes is that they all showed very low oxidation potentials, less than 0.1V. These observations lead us to study electron transfer study with methyl violegen which is a known electron acceptor in the literature.;Third, a new method to form platinum-carbon bond was discovered and developed. Mimicking Stille coupling reaction, it was shown that aryl group can indeed be transferred into platinum metal having strong phosphine ligand provided that Cu(I) salts used as catalyst. Different ligands were tested to investigate the scope of the reaction, a library of monosubstituted, symmetrically disubstituted and asymmetrically disubstituted platinum complexes were prepared. Basic photophysical properties i.e. ground-state absorption, steady-state emission in both air-saturated and argon purged solutions were studied.;Finally, the novel carbon-platinum bond formation reaction was used to synthesize a series of platinum complexes in which 2,1,3-benzothiadiazole was ligated with various electron-rich systems was connected via platinum metal. Extensive photophysical and electrochemical investigation was conducted on these novel platinum complexes. |
