DFT study of structure, IR and Raman spectra of the fluorescent “Janus” dendron built from cyclotriphosphazene core

Strategies for the Preparation of Phosphorus Janus Dendrimers and Their Properties

Dendrimers, being highly branched monodispersed macromolecules, predominantly exhibit identical terminal functionalities within their structural framework. Nonetheless, there are instances where the presence of two distinct surface functionalities becomes advantageous for the fulfilment of specific properties. To achieve this objective, one approach involves implementing Janus dendrimers, consisting of two dendrimeric wedges terminated by dissimilar functionalities. The prevalent method for creating these structures involves the synthesis of dendrons that possess a core functionality that complements that of a second dendron, facilitating their coupling to generate the desired dendrimers. In this comprehensive review, various techniques employed in the fabrication of phosphorus-based Janus dendrimers are elucidated, displaying the different coupling methodologies employed between the two units. The advantages of phosphorus dendrimers over classic dendrimers will be shown, as the presence of at least one phosphorus atom in each generation allows for the easy monitoring of reactions and the confirmation of purity through a simple technique such as ³¹P NMR, as these structures typically exhibit easily interpretable patterns.

Intramolecular excimer formation in hexakis(pyrenyloxy)cyclotriphosphazene: photophysical properties, crystal structure, and theoretical investigation

A hexakis(pyrenyloxy)cyclotriphosphazene was synthesized by the reaction of N₃P₃Cl₆ with 2-hydroxypyrene, and its excimer emission has been investigated.