A New Dinuclear Copper(Ⅱ) Complex of a Bis-macrocyclic Ligand: Synthesis, Characterization, Crystal Structure and Magnetic Properties

• 来源期刊: 中国化学（英文版）
• 学科: 化学
• 年，卷（期）: 2001,（8）
• 所属期刊栏目: Articles
• 页码范围: 778-782
• 页数: 5页
• 分类号: O6
• 语种: 英文

摘要

A new dinuclear Cu(Ⅱ) complex, [Cu2L(N3)2] (ClO4)1.5·(OH)0.5· 2H2O· 0.5C2H~OH (1), of a bis-macrocyclic ligand, 2, 6-bis(1,4,7,10-tetraazacyclododecan-10-ylmethyl) - methoxyboxybenzene (L), has been synthesized, characterized and structurally determined by X-ray diffraction analysis.Complex 1 crystallizes in orthorhombic crystal system, Pca2(1) 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 Cu…Cu nonbonding distances are 0.9855 and 0.7298 nm, respectively. Variable temperature magnetic susceptibility measurements in the range of 4.2-300 K indicate that there exists weak intra- and inter-molecular antiferromagnetic coupling between the Cu (Ⅱ) centers with 2J= -4.2 cm-1 and Θ= -0.47 K.