Heterobinuclear Complexes as Tectons in Designing Coordination Polymers

Abstract

Four new 1D coordination polymers have been constructed from [LCu II M II ] nodes connected by various spacers—the dianion of pyrazole-3,5-dicarboxylic acid (pzdc 2− ), the trianion of trimesic acid (trim 3− ), the tetracyanonickelate(II) anion ([Ni(CN) 4 ] 2− ), and the dicyanamide anion (dca − ) [M II = Mn II, Co II, and L 2− is the dianion of the Schiff-base resulting from the 2:1 condensation of 3-methoxysalicylaldehyde with 1,3-propanediamine, L 2− = N, N ′-propylene-bis-(3-methoxysalycilideneiminato)]: [LCuMn(pzdc)(CH 3 OH)(H 2 O)]·H 2 O ( 1 ), [LCuMn(trim) 2/3 (CH 3 OH) 2/3 (H 2 O) 1/3 ]·0.66(H 2 O)·0.66(CH 3 OH) ( 2 ), [LCuCo(dca) 2 ] ( 3 ), and [LCu(CH 3 OH)(H 2 O)Mn(NC) 2 Ni(CN) 2 ]·(H 2 O)(CH 3 CN) ( 4 ). The fifth compound, [{CuL}K{LCu}{Ag(CN) 2 }] ( 5 ), was obtained by reacting [CuL] with K[Ag(CN) 2 ]. The magnetic investigation of compounds 1, 2, and 4 reveals antiferromagnetic Cu II −Mn II intranode interactions ( 1, J = −48.9 cm −1; 2, J = −64.7 cm −1; and 4, J = −60.4 cm −1; H = − J S Mn S Cu ), as well as weak internodes antiferromagnetic interactions (for compounds 1 and 4 ). In the case of 2, a weak ferromagnetic internode interaction occurs through the spin polarization mechanism.