The crystal and molecular structure of (p-terephthalato)bis[ (N-(2-(diethylamino)ethyl)salicylidenaminato)copper-(11)-water-methanol, [ C U~( S~~N E~~)~( C~H~~~) ]~H~~~C H~~H ,where SalNEtz = N-(2-(diethylamino)ethyl)-salicylidenaminate, has been determined by single-crystal X-ray analysis. The compound crystallizes in the monoclinic system, space group P21/c, with a = 7.379(1) A, b = 7.546(2) A, c = 33.783(6) A, and 8-100.40(1)0. In the molecular structure of this centrosymmetric compound the two equivalent copper(I1) ions are bridged by the terephthalato ligand coordinated in an amphimonodentate mode. The local geometry around both copper(I1) ions is square planar, whereas two noncoordinated molecules, namely a water and a methanol molecule, are also present.The fitting of the variable-temperature magnetic susceptibilitiy data to the HDVV (H = 2&$), S1 = Sz = spin exchange model yields a 2Jvalue of 0.6 cm-l. The results of extended Huckel calculations on a model compound are consistent with the existense of accidental orthogonality between the magnetic orbitals.

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