Binuclear and trinuclear complexes of exoO2-cyclam
作者:Vivienne A. White、Russell D. L. Johnstone、Keri L. McCall、Nicholas J. Long、Alexandra M. Z. Slawin、Neil Robertson
DOI:10.1039/b701166k
日期:——
Complexes of the ligand 2,3-dioxo-1,4,8,11-tetraaza-cyclotetradecane (exoO2-cyclam) have been prepared of formula [M1M2(exoO2-cyclam)}2][BPh4]2 where M1M2 = CoCo (3), ZnZn (4), MnCu (5), FeCu (6), CoCu (7), NiCu (8), ZnCu (9), and [(bipy)2RuCu(exoO2-cyclam)}][NO3]2 (10). Complex 10 crystallised in the space group C2/c and shows Jahn–Teller distorted Cu(II) with axial nitrate ligands. The Cu(exoO2-cyclam)} moiety chelates to the Ru with Ru–O distances of 2.082(5) Å. Complexes 5–10 show a Cu(II)/Cu(III) redox process and additional metal-centred (6, 8, 10) processes and ligand-centred (10) processes. The electrochemical and UV-Vis spectroelectrochemical study of 10 suggested two closely-spaced oxidations based on the Cu and Ru centres which suggests that substituted derivatives of 10 will be of interest for enhanced charge separation in dye-sensitised solar cells. Magnetic susceptibility measurements revealed dominant antiferromagnetic coupling within the trinuclear species 3, 5–8. Complex 10 showed Curie–Weiss behaviour with weak intermolecular interactions.
制备了配体 2,3-二氧代-1,4,8,11-四氮杂环十四烷(exoO2-cyclam)的配合物,其式为 [M1M2(exoO2-cyclam)}2][BPh4]2,其中 M1M2 = CoCo (3)、ZnZn (4)、MnCu (5)、FeCu (6)、CoCu (7)、NiCu (8)、ZnCu (9) 和 [(bipy)2RuCu(exoO2-cyclam)}][NO3]2 (10)。配合物 10 在空间群 C2/c 中结晶,显示出带有轴向硝酸配体的 Jahn-Teller 扭曲 Cu(II)。Cu(exoO2-cyclam)}分子与 Ru 发生螯合,Ru-O 间距为 2.082(5)埃。络合物 5-10 显示了 Cu(II)/Cu(III) 氧化还原过程以及以金属为中心的附加过程(6、8、10)和以配体为中心的附加过程(10)。对 10 的电化学和紫外-可见光谱电化学研究表明,基于 Cu 和 Ru 中心的两个紧密间隔的氧化过程表明,10 的取代衍生物将有助于增强染料敏化太阳能电池中的电荷分离。磁感应强度测量显示,在三核物种 3、5-8 中,反铁磁耦合占主导地位。复合物 10 表现出居里-魏斯行为,分子间相互作用微弱。
Cronin, Leroy; Mount, Andrew R.; Parsons, Simon, Journal of the Chemical Society, Dalton Transactions, <hi>1999</hi>, # 12, p. 1925 - 1927
作者:Cronin, Leroy、Mount, Andrew R.、Parsons, Simon、Robertson, Neil
DOI:——
日期:——
Copper(II), copper(III) and nickel(II) complexes of the macrocyclic diamide ligands 1,4,7,10-tetra-azacyclododecane-2,3-dione, 1,4,7,11-tetra-azacyclotridecane-2,3-dione, 1,4,8,11-tetra-azacyclotetradecane-2,3-dione and electrochemical studies on the copper and nickel complexes of 1,4,8,11-tetra-azacyclotetradecane-5,7-dione
作者:Robert W Hay、Ramesh Bembi、Walter Sommerville
DOI:10.1016/s0020-1693(00)87323-5
日期:1982.1
350 nm. Cyclic voltammetry on the copper(II)/copper(III) and nickel(II)/nickel(III) redox systems with 1,4,8,11-tetraazacyclotetradecane-5,7-dione (L D ) indicate completely reversibility of the copper(II)/copper(III) couple in N,N-dimethylsulphoxide solution (E 1 2 = +0.43 V versus Ag/AgCl at 25 °C). The nickel(II)/nickel(III) couple is irreversible in aqueous solution.
摘要合成了三个新的大环二酰胺配体1,4,7,10-四氮杂环十二烷-2,3-二酮(LA),1,4,7,11-四氮杂环十二烷-2,3-二酮(LB )和1,4,8,11-四氮杂环十四烷-2,3-二酮(LC)。这些配体的许多铜(II)和镍(II)配合物已被表征为固态。由于两个酰胺质子的电离,生成中性络合物[M(L to2H)],该络合物在水溶液中为非电解质。LB的黄色平面镍(II)配合物[Ni(LB2H)]与蓝色八面体物种[Ni(LB2H)(H 2 O)2]平衡存在。对于八面体的平面平衡,在25°C下K = 0.51,相应的热力学参数为ΔH°= 4.23 kcal mol -1和ΔS°298 = +12.8 cal K -1 mol -1。LA的铜(II)配合物 LB和LC在水溶液中被过氧化氢氧化,得到相应的铜(III)配合物。铜(III)配合物的颜色为棕黄色,在大约d处有d带。350纳米 具有1
Cronin, Leroy; Mount, Andrew R.; Parsons, Simon, Journal of the Chemical Society, Dalton Transactions, 1999, # 12, p. 1925 - 1927
作者:Cronin, Leroy、Mount, Andrew R.、Parsons, Simon、Robertson, Neil
DOI:——
日期:——