Synthesis, Optical Spectroscopy, and Laser and Biomedical Imaging Application Potential of 2,4,6-Triphenylpyrylium Tetrachloroferrate and Its Derivatives.

Synthesis, optical spectroscopic properties, two-photon (TP) absorption-induced fluorescence, and laser and bioimaging application potentials of 2,4,6-triphenylpyrylium tetrachloroferrate (),4-(4-methoxyphenyl)-2,6-diphenylpyrylium tetrachloroferrate (), 2,6-bis(4-methoxyphenyl)-4-phenylpyrylium tetrachloroferrate (), and 2,4,6-tris(4-methoxyphenyl)pyrylium tetrachloroferrate () are presented. The synthesis involves the conversion of pyrylium tosylates to pyrylium chlorides, followed by transformation into - on heating to reflux with FeCl in acetonitrile. They are characterized using H and C NMR spectra in CDOD, and FTIR and Raman spectroscopic techniques.

Poly(Pyridinium Salt)s Containing 2,7-Diamino-9,9'-Dioctylfluorene Moieties with Various Organic Counterions Exhibiting Both Lyotropic Liquid-Crystalline and Light-Emitting Properties.

A series of poly(pyridinium salt)s-fluorene main-chain ionic polymers with various organic counterions were synthesized by using ring-transmutation polymerization and metathesis reactions. Their chemical structures were characterized by Fourier Transform Infrared (FTIR), proton (H), and fluorine 19 (F) nuclear magnetic resonance (NMR) spectrometers. These polymers showed a number-average molecular weight (Ms) between 96.

Thermotropic Liquid-Crystalline and Light-Emitting Properties of Bis(4-aalkoxyphenyl) Viologen Bis(triflimide) Salts.

A series of bis(4-alkoxyphenyl) viologen bis(triflimide) salts with alkoxy chains of different lengths were synthesized by the metathesis reaction of respective bis(4-alkoxyphenyl) viologen dichloride salts, which were in turn prepared from the reaction of Zincke salt with the corresponding 4-n-alkoxyanilines, with lithium triflimide in methanol. Their chemical structures were characterized by H and C nuclear magnetic resonance spectra and elemental analysis. Their thermotropic liquid-crystalline (LC) properties were examined by differential scanning calorimetry, polarizing optical microscopy, and variable temperature X-ray diffraction.