A problem has arisen in using chiral shift reagents (CSR) and solvating agents (CSA) to determine meso racemic forms of diastereoisomers which the stereogenic centers molecules are separated by achiral spacers. It is found that NMR signals both may exhibit doubling on addition CSR/CSA, means unequivocal assignments cannot be made without characterizing effects for separate forms; this particularly important additions CSR/CSA at relatively low concentrations, always result splitting some...

The reactions of a flexible ligand hexakis(3-pyridyloxy)cyclotriphosphazene (HPCP) with variety silver(I) salts (AgX; X = NO3(-), PF6(-), ClO4(-), CH3PhSO3(-), BF4(-) and CF3SO3(-)) afforded six coordination polymers, namely {[Ag2(HPCP)]·(NO3)2·H2O}n (1), {[Ag2(HPCP)(CH3CN)]·(PF6)2}n (2), {[Ag2(HPCP)(CH3CN)]·(ClO4)2}n (3), [Ag3(HPCP)(CH3PhSO3)3]n (4), [Ag2(HPCP)(CH3CN)(BF4)2]n (5) {[Ag(HPCP)]·(CF3SO3)}n (6). All the isolated crystalline compounds were structurally determined by X-ray...

In this study, a series of cyclotriphosphazene derivatives containing Schiff base (3a-3d) were synthesized by the reactions hexachlorocyclotriphosphazene (1) with bis-aryl bases (2a-2d) having different terminal groups (H, F, Cl, and Br). The products characterized elemental mass analyses, FT-IR, $^{1}$H, $^{13}$C, 31 P NMR spectroscopies. Furthermore, structure compound 3a was also determined X-ray crystallography. thermal behaviors spectral properties new compounds investigated results...

Abstract Triple diamino-bridged cyclotriphosphazene (1) was reacted in a 1:8 stoichiometry with the sodium derivatives of long-chain diols [1-octanol, 1-decanol, 1-dodecanol, 1-hexadecanol] tetrahydrofuran (THF) at room temperature to form hexa-substituted (2, 3, 4 and 5, respectively), whose mesomorphic behaviours were investigated for their possible applications as liquid crystals. The cylindrical-type (2–5) characterised by mass elemental analyses Fourier transform infrared spectroscopy...

The synergistic effect between carbazole and indole fluorophores enhanced the fluorescence properties of hybrid cyclotriphosphazene derivative (7a).

Nucleophilic substitution reactions of N3P3Cl4[NH(CH2)3NMe] (1) and N3P3Cl4[NH(CH2)3O] (2) with mono-functional alcohols (methanol, 2,2,2-trifluoroethanol, phenol) a secondary amine (pyrrolidine) were used to investigate the relationship between incoming nucleophile proportions products substituents that are cis or trans spiro NH moiety. The reaction characterized by elemental analysis, mass spectrometry, 1H 31P NMR spectroscopy configurational isomers X-ray crystallography. Six have been...

Nucleophilic substitution reactions of N3P3Cl4[O(CH2)2NCH3], (1) with the sodium salts mono- and di-functional alcohols [methanol (2), phenol (3), tetraethyleneglycol (4) 1,3-propanediol (5)] were carried out in order to investigate a possible directing effect spiro O-moiety on formation mono-substituted (2a, 3a), non-geminal di-substituted (2c, 3c) ansa (4a, 5a) derivatives. Compounds isolated from characterized by elemental analysis, mass spectrometry, 1H 31P NMR spectroscopy X-ray...

The substitution reactions of the monospiro and geminally disubstituted cyclotriphosphazene derivatives N3P3Cl4R2 (R2 = OCH2(CF2)2CH2O (1a), SPh (1b), OCH2CH2CH2O (1c), NHPh (1d), OCH2CH2CH2NH (1e), NHBut (1f)) with two secondary amines (pyrrolidine dimethylamine) were carried out to investigate geminal or non-geminal directing effects in mixed substituent cyclophosphazenes. relative amounts isomeric products, trans cis, was established quantitatively from 31P NMR spectra reaction mixtures....

Cyclophosphazene-based high-efficiency excited state intramolecular proton transfer (ESIPT) active and inactive molecules were prepared depending on the different bonding patterns of difunctional phenol-pyrazol reagent.

Deprotonation reactions of cyclophosphazenes containing secondary amino groups in the side chain lead to a doubly bridged tricyclophosphazene structure or cyclophosphazene−cyclophosphazane−cyclophosphazene compound, which are very stable and could be used as building blocks for larger structures.

Cyclotriphosphazene derivatives containing a P-NHR group in the side-chain react presence of strong base to form stable intermolecular bridged products. Reaction sodium hydride with mono-spiro cyclophosphazene having P-NH group, N(3)P(3)Cl(4)[O(CH(2))(3)NH], (1a) or N(3)P(3)Cl(4)[CH(3)N(CH(2))(3)NH], (1b) leads formation bis-cyclophosphazenes an eight-membered ring ansa arrangement (2a, 2b) whereas reaction mono-amino [N(3)P(3)Cl(5)(NHR), R = n-hexyl, 3a; i-Pr, 3b; Ph, 3c] give four-membered...

X-ray crystallographic evidence shows that nucleophilic substitution reactions of two different types cyclophosphazene derivatives with relatively rigid nine-membered ansa rings leads to the first demonstration retention configuration in these molecular systems.

Nucleophilic substitution reactions of cyclotriphosphazene derivatives having five-membered spiro rings, N3P3Cl4[O(CH2)2X] (X = NH or O) with alkoxides (of tetraethylene glycol and some mono-functional alcohols) give unexpected rearrangements to form stable seven-membered ring ansa compounds, even though crystallographic evidence shows distortion compression the cyclophosphazene ring. With weaker nucleophiles such as sodium phenoxide pyrrolidine at a PCl2 group is preferred no rearrangement...

Octachlorocyclotetraphosphazene (1) was reacted with butylamines [n-butyl, i-butyl, sec-butyl, and t-butyl] in a 1:0.8 mol ratio THF to obtain cyclotetraphosphazenes bearing P-NH group, N4P4Cl7(NHR) [R = n-butyl (2a), i-butyl (2b), sec-butyl (2c), t-butyl (2d)](2a–d). The cyclotetraphosphazene derivatives 2a, 2b, 2c were treated sodium hydride giving rise new type of cyclophosphazene compounds (P8N8 ring) consisting three fused tetramer rings (3a–c). Whereas reaction the...