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.

Phosphine Oxide Containing Poly(pyridinium salt)s as Fire Retardant Materials.

Six new rugged, high-temperature tolerant phosphine oxide-containing poly(4,4'-(-phenylene)-(2,6-diphenylpyridinium)) polymers , , , , , and are synthesized, characterized, and evaluated. Synthesis results in high yield and purity, as confirmed by elemental, proton (H), and carbon 13 (C) nuclear magnetic resonance (NMR) spectra analyses. High glass transition temperatures ( > 230 °C) and high char yields (>50% at 700 °C) are determined by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), respectively.

Conformation-specific spectroscopy and populations of diastereomers of a model monolignol derivative: chiral effects in a triol chain.

Single-conformation spectroscopy of two diastereomers of 1-(4-hydroxy-3-methoxyphenyl)propane-1,2,3-triol (HMPPT) has been carried out under isolated, jet-cooled conditions. HMPPT is a close analog of coniferyl alcohol, one of the three monomers that make up lignin, the aromatic biopolymer that gives structural integrity to plants. In HMPPT, the double bond of coniferyl alcohol has been oxidized to produce an alkyl triol chain with chiral centers at C(α) and C(β), thereby incorporating key aspects of the β-O-4 linkage between monomer subunits that occurs commonly in lignin.