Alexi Nedeltchev

CHEM IO

Six new rugged, high-temperature tolerant phosphine oxide-containing poly(4,4'-(p-phenylene)-bis(2,6-diphenylpyridinium)) polymers P-1, P-2, P-3, P-4, P-5, and P-6 are synthesized, characterized, and evaluated. Synthesis results in high yield and purity, as confirmed by elemental, proton (1H), and carbon 13 (13C) nuclear magnetic resonance (NMR) sp...

A new class of bisquinoline diamines prepared by Friedlander condensation reaction are reported showing stable amorphous state with high glass transition temperatures up to 150 degrees C and high thermal stabilities >370 degrees C. Additionally, they show excellent fluorescent properties in the blue, green and yellow region of visible light in both...

Several poly(pyridinium salt)s containing various aromatic diamine moieties and tosylate counterions were prepared by the ring-transmutation polymerization reaction of bis(pyrylium tosylate) with aromatic diamines in dimethyl sulfoxide at 130−135 °C for 48 h and their tosylate counterions were exchanged to triflimide polymers by a metatheses reacti...

Compounds bearing electrostatic charges have unique properties including outstanding ionic-conductivity when compared with neutral ones. On the other hand, amorphous molecular materials harness the advantages of small molecules with high purity, defined structures and monodispersity, while still being easily processable into thin films and fibers....

Several new poly(pyridinium salt)s with quinoline diamine moieties in their backbones with tosylate and triflimide counterion were prepared by either a ring-transmutation polymerization reaction with bis(pyrylium tosylate) with a series of isomeric quinoline diamines in dimethyl sulfoxide (DMSO) for 48 h at 130–140 °C or a metathesis reaction of th...

A new class of conjugated quinoline amines was prepared by Friedländer condensation reaction. They showed stable amorphous state below glass transition temperatures as examined by differential scanning calorimetry and X-ray diffraction studies. Additionally, they exhibited fluorescence properties in the blue to green region of visible spectrum in b...

Several novel poly(pyridinium salt)s with heterocyclic pyridine moieties in their backbones with tosylate and triflimide counterions were prepared by either ring-transmutation polymerization reaction of phenylated-bis(pyrylium tosylate) with isomeric pyridine diamines of 4-phenyl-2,6-bis(4-aminophenyl)pyridine in dimethyl sulfoxide (DMSO) for 48 h...

Poly(pyridinium salt)s containing ambipolar diamine moiety exhibiting lyotropic LC phase, hand-drawn fibers, and aggregated entities.

Several novel poly(pyridinium salt)s with heterocyclic bisquinoline moieties having both tosylate and triflimide counterions were prepared by either ring-transmutation or metathesis reaction. Their chemical structures were established by using 1H and 13C NMR, FTIR and elemental analysis. Their number-average molecular weights (Mn) ranged from 53,00...

A series of azomethine dimers were prepared by condensation reactions of benzaldehyde, biphenylcarboxaldehyde and 9-anthraldehyde with various aromatic diamines of varying flexibility in ethanol in the presence of tosic acid. Their chemical structures were determined by Fourier transform infrared and 1H and 13C nuclear magnetic resonance (NMR) spec...

Several poly(pyridinium salt)s containing various organic counterions and tetraoxyethylene units in their backbones were synthesized by either ring-transmutation polymerization reaction of 4,4'-(1,4-phenylene)bis(2,6-diphenylpyrylium tosylate) with bis(2-(2-(4-aminophenoxy)ethoxy)ethyl) ether on heating in dimethyl sulfoxide or metathesis reaction...

Several anthracene derivatives were prepared by a single-step reaction and characterized their thermal properties by differential scanning calorimetry (DSC) and thermogravimetric analyses. Their photoluminescence properties were examined in a large number of organic solvents of increased polarity that included toluene, chloroform, tetrahydrofuran,...

A series of protic ionic salts were synthesised by a simple acid–base reaction from various pyridine derivatives and dodecylbenzenesulfonic acid in a common organic solvent and characterised in terms of their thermal and lyotropic liquid crystalline properties using various experimental techniques. All of them exhibited lyotropic liquid crystalline...

Several novel poly(pyridinium salt)s with oxyalkylene moieties in the main chain with bulky organic counterions (tosylate and triflimide) were prepared by either the ring-transmutation polymerization of phenylated bis(pyrylium tosylate) salt with a series of oxyalkylene containing diamines in dimethyl sulfoxide on heating for 48h or the metathesis...

A series of conjugated, bispyridyl and tetrapyridyl compounds were synthesized from either terephthalaldehyde or isophthalaldehyde and activated pyridyl compounds by Knoevenagel reaction on heating in acetic anhydride in presence of acetic acid and their optical and thermal properties were examined. All of them exhibited photoluminescence in chloro...

Two poly(pyridinium salt)s with anthracene moieties in the main chain as well as tosylate and triflimide as counterions were prepared by either the ring-transmutation polymerization of phenylated bis(pyrylium tosylate) salt with 2,6-diaminoanthracene in dimethyl sulfoxide or the metathesis reaction of the corresponding tosylate polymer with lithium...

The synthesis of two new ionic polymers, poly(pyridinium salts) containing bulky organic counterions tosylate or triflimide ions and nine methylene units in their backbones and the characterization of their thermotropic LC properties was investigated. The ionic polymers were prepared by either the ring-transmutation polymerization or the metathesis...

The thermotropic liquid-crystalline (LC) and light-emitting properties of main-chain ionene polymers based on trans-1,2-Bis(4-pyridyl)ethylene were analyzed. It was found that these ionene polymers exhibited two endotherms in differential scanning calorimetry (DSC) thermograms. It was also found that ionene polymers containing triflimide as counter...