Copper(II) thenoyltrifluoroacetonate as acceptor matrix in design of heterospin complexes

摘要: Abstract Coordination compounds of Cu(II) thenoyltrifluoroacetonate with stable 2-imidazoline nitroxides were synthesized; their structure and magnetic properties investigated. The complex a pyrazole nitroxide was isolated as two polymorphous modifications. For both polymorphs, the is comprised Cu(tta)2(NITPz1,3Me) molecules shaped nearly regular pyramids four O atoms tta ligands lying at base. solid polymorphs are constructed from formal binuclear fragments appearing when pyramid bases neighboring approach each other forming rather short contacts Cu–S (3.848 3.596 A), due to which differ considerably in properties. In modification longer distances, there no exchange interactions between paramagnetic centers whereas polymorph shorter distances significant analogous those real dimer based on Cu(AcO)2 matrix nitroxide.