Macrocyclic Cu(ii)-organophosphonate building block with room temperature magnetic ordering

Abstract

Engineering a copper coordination sphere with organoimine ligands and tuning the organophosphonate protonation states produced [{Cu(2,2′-bpy)}₂(HO₃P(CH₂)₈PO₃H₂)₄] (1) and [{Cu(terpy)}₂(2,7-FDA-H₂)₂]·(2,7-FDA-H₄)(2H₂O) (2) (2,7-FDA-H₄ = 2,7-fluorenonediphosphonic acid) macrocyclic copper-organophosphonate building blocks. 1 exhibits high temperature magnetic ordering, while 2 is paramagnetic. The structures were characterized by single crystal X-ray diffraction.