Synthesis, thermal and photophysical properties of phenoxy-substituted dendrimeric cyclic phosphazenes

Chiral configurations in cyclophosphazene chemistry

“…Other crystal examples of the cyclotriphosphazene derivatives including pseudoasymmetric centers for only one form of Type II(6) as cis-meso-1 or cis-meso-2, 76a-c and 77 [37], 78* [105], 79-82* [106], 83 [107] are given below. There is no crystallographic example for the Type II(2) rac-trans (84a-c* [108]), Type II(4) (85 [109]) and Type II(6) rac-trans (86 [107]) which their configurations were predicted by NMR spectroscopy. …”

“…Compound 123 [156] which has a pseudoasymmetric center is a meso form. Although it is of interest to find that a number of metallo-cyclotriphosphazenes have centers of chirality and that they exist in racemic or meso forms (107)(108)(109)(110)(111)(112)(113)(114)(115)(116)(117)(118)(119)(120)(121)(122)(123), it is perhaps more important for the synthetic chemist to understand what structural types lead to metallocyclophosphazenes with centers of chirality, especially because an achiral molecule may become chiral after complexation. The compounds (107)(108)(109)(110)(111)(112)(113)(114)(115)(116)(117)(118)(119)(120)(121)(122)(123) should be sub-divided into catagories that depend primarily on the number of binding sites of the metal to the cyclophosphazene derivative and then by the configurational arrangement of the substituents involved in the binding and whether skeletal nitrogens are also involved in complexation, because this leads to great diversity of binding modes.…”

4‐triphenylmethylaniline substituted cyclotriphosphazene derivatives assisted by multiple phenyl rings

“…[ 10–15 ] Thermally and chemical stable groups can be modified to cyclotriphosphazenes via nucleophilic substitution reactions in order to enhance thermal stability of cyclotriphosphazene core. Especially, aromatic rings are such feasible groups to increase thermal property of heterocyclic phosphazene ring [ 13–15 ] that 4‐triphenylmethylaniline containing more than one aromatic ring could be substituted for cyclotriphosphazene and increase thermal stability. Although many efforts have been made on the reactions of cyclotriphopshazene with different primary amines, [ 16,17d,18 ] there is no work on its reactions with cyclotriphosphazenes in literature so far.…”

Synthesis of new cyclotriphosphazene derivatives bearing Schiff bases and their thermal and absorbance properties

“…Heterocyclic systems containing mainly phosphorus, nitrogen, sulfur, and oxygen atoms compose a large class of inorganic compounds and they have applications in various areas [1][2][3][4][5]. The cyclophosphazenes, (NPCl 2 ) 3,4 , are among the most important members of these systems [3][4][5][6][7]. Cyclotriphosphazene and its derivatives have particularly great stability thanks to their six-membered ring structures.…”

“…Cyclotriphosphazene and its derivatives have particularly great stability thanks to their six-membered ring structures. In addition, their physical and chemical properties can be adjusted via appropriate groups substituted on the phosphorus atoms [6][7][8][9][10][11][12][13][14][15].…”