| Popis: |
A new dinuclear Cu(II) complex, [Cu2L(N3)2](ClO4)1.5 (OH)4.5 · 2H2O 0.5C2H5OH (1), of a bis-macrocyclic ligand, 2,6-bis(l,4,7,10-tetraazacyclododecan-10-ylmethyl)-methoxybenzene (L), has been synthesized, characterized and structurally determined by X-ray diffraction analysis. Complex 1 crystallizes in orthorhombic crystal system, Pca2(l) space group with a = 1.5371(3), b = 1.6641(3), c = 3.0950(6) nm, V = 7.917(3) nm3, Fw = 904.62, Z=8, Dc= 1.529 g/cm3 and final R = 0.0568, wR = 0.1406 for 10410 observed reflections with I≥2σ (I). Both Cu(II) centers in the structure are coordinated by four nitrogen atoms of 1,4,7, 10-tetraazacyclododecane (cyclen) and a nitrogen donor of the axial azide anion. Each Cu(II) center is in a square-pyramidal coordination environment, and the intra-and nearest inter-molecular CuCu nonbonding distances are 0.9855 and 0.7298 nm, respectively. Variable temperature magnetic susceptibility measurements in the range of 4.2–300 K indicate mat there exists weak intra- and inter-molecular antiferromagnetic coupling between the Cu(II) centers with 27= −4.2 cm−1 and Θ = −0.47 K. |
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