Vassilyeva Olga Yu, Buvaylo Elena A, Kokozay Vladimir N, Melnyk Andrii K, Skelton Brian W
Department of Chemistry, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska str., Kyiv 01601, Ukraine.
Institute for Sorption and Problems of Endoecology, The National Academy of Sciences of Ukraine, 13 General Naumova str., Kyiv 03164, Ukraine.
Acta Crystallogr E Crystallogr Commun. 2020 May 5;76(Pt 6):790-793. doi: 10.1107/S2056989020005903. eCollection 2020 Jun 1.
The new copper(II) complex, namely, di-μ-chlorido-bis-{chlorido-[meth-yl(pyri-din-2-yl-methyl-idene)amine-κ ,']copper(II)}, [CuCl(CHN)], (I), with the ligand 2-pyridyl-methyl--methyl-imine (, a product of Schiff base condensation between methyl-amine and 2-pyridine-carbaldehyde) is built of discrete centrosymmetric dimers. The coordination about the Cu ion can be described as distorted square pyramidal. The base of the pyramid consists of two nitro-gen atoms from the bidentate chelate [Cu-N = 2.0241 (9), 2.0374 (8) Å] and two chlorine atoms [Cu-Cl = 2.2500 (3), 2.2835 (3) Å]. The apical position is occupied by another Cl atom with the apical bond being significantly elongated at 2.6112 (3) Å. The angles of the base are 155.16 (3) and 173.79 (2)°. The CuCu separation in the dimer is 3.4346 (3) Å. In the crystal structure, the loosely packed dimers are arranged in stacks propagating along the axis. The X-band polycrystalline 77 K EPR spectrum of (I) demonstrates a typical axial pattern characteristic of mononuclear Cu complexes. Compound (I) is redox active and shows a cyclic voltammetric response with = -0.037 V silver-silver chloride electrode (SSCE) assignable to the reduction peak of Cu/Cu in methanol as solvent.
新型铜（II）配合物，即二-μ-氯代-双-{氯代-[甲基（吡啶-2-基甲基亚胺基）胺-κN']铜（II）}，[CuCl(CHN)]，（I），其配体为2-吡啶基甲基-N-甲基亚胺（，甲胺与2-吡啶甲醛席夫碱缩合产物），由离散的中心对称二聚体构成。铜离子周围的配位情况可描述为扭曲的四方锥构型。锥底由双齿螯合物中的两个氮原子[Cu-N = 2.0241 (9)，2.0374 (8) Å]和两个氯原子[Cu-Cl = 2.2500 (3)，2.2835 (3) Å]组成。顶端位置由另一个氯原子占据，顶端键显著伸长至2.6112 (3) Å。锥底的角度分别为155.16 (3)°和173.79 (2)°。二聚体中Cu···Cu间距为3.4346 (3) Å。在晶体结构中，松散堆积的二聚体沿c轴方向堆叠排列。（I）的X波段多晶77 K EPR谱显示出单核铜配合物典型的轴向特征。化合物（I）具有氧化还原活性，在以甲醇为溶剂的体系中，相对于银-氯化银电极（SSCE），其循环伏安响应的E1/2 = -0.037 V，可归属于CuII/CuI的还原峰。
