Abstract
Two new di-μ-Cl dinuclear CuII complexes [Cu(HL1)Cl2]2(ClO4)2 (1) and [Cu2(L2)2Cl2](ClO4)2 (2) with the pyridyl-functionalized diazamesocyclic ligands 1,5-bis(pyridin-4-ylmethyl)-1,5-diazacyclooctane (L1) and 1-(pyridin-2-ylmethyl)-1,4-diazacycloheptane (L2) have been synthesized and structurally characterized by single crystal X-ray diffraction. Complex 1 is a unique paramagnetic CuII metallamacrocycle (ca. 14.1 × 3.5 Å2) directly self-assembled by metal ions and the organic spacer under strongly acidic conditions. The magnetic properties of both complexes have been investigated by variable-temperature magnetic susceptibility measurements. Although complexes 1 and 2 have almost the same geometrical parameters for CuII, their magnetic parameters vary from ferromagnetic for 1 to antiferromagnetic for 2. The magneto-structural correlation of such complexes has been further developed.
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