Na/Cu < sup > II < /sup > /Cu < sup > I < /sup > Complexes of Compartmental Schiff Base Ligands Incorporating the [Cu(NCO) < inf > 2 < /inf > ] < sup > − < /sup > Ion

Abstract

Two new NaI/CuI,II polynuclear compounds [(NaCu3((R,R)-3-MeOSalcy)2(NCO)2](1) and [(NaCu2(3-MeOSalpn)(NCO)2] (2) have been synthesized using the Schiff base (SB) ligands, (R,R)-3-MeOSalcy=(R,R)–N,N′-bis(3-methoxysalicylidene)-1,2-diaminocyclohexane and 3-MeOSalpn=N,N′-bis(3-methoxysalicylidene)-1,3-diaminopropane, respectively. Both complexes contain the rarely observed linear [Cu(NCO)2]− ion which links [{CuII(SB)}2Na]+ ions in 1 or [{CuII(SB)Na}2]2+ ions in 2 producing different linear chain topologies. The mixed valent CuI/IINa network in compound 1 allows for greater magnetic isolation of the paramagnetic ions as compared to compound 2, leading to differences in their EPR spectra.