Synthesis,spectroscopic characterisation,electron microscopic study and thermogravimetric analysis of a phosphorus-containing dendrimer with phloroglucinol as a core unit

Abstract

A phosphorus-containing dendrimer of up to four generations with phloroglucinol as a core unit was synthesised using a divergent growth method. A repetitive synthetic sequence of several types of reactions was performed by using P(O)Cl₃, 3-hydroxybenzaldehyde, 4-hydroxybenzaldehyde and p-phenylenediamine for the synthesis of this dendritic molecule G₄ involving simple condensation reactions. This Schiff's base macromolecule possesses 12 imine bonds and 6-OH groups on the periphery. The structures of the intermediate generations G₁, G₂, G₃ were confirmed by IR, ¹H, ¹³C, ³¹P NMR and LC/EI MS. The final dendrimer G₄ was characterised by IR, ¹H, ¹³C, ³¹P NMR, Maldi-tof mass spectrometer and C, H, N analysis. The scanning electronic microscopic study and thermogravimetric analysis were also performed for the final dendrimer (G₄).