Phosphodiester Cleavage Properties of Copper(II) Complexes of 1,4,7-Triazacyclononane Ligands Bearing Single Alkyl Guanidine Pendants
作者:Linda Tjioe、Tanmaya Joshi、Craig M. Forsyth、Boujemaa Moubaraki、Keith S. Murray、Joël Brugger、Bim Graham、Leone Spiccia
DOI:10.1021/ic2019814
日期:2012.1.16
addition to a tacn ring from L1 ligand, each copper(II) center in C1 is coordinated to a neutral guanidine pendant. In contrast, the guanidinium pendants in C2 and C3 are protonated and extend away from the Cu(II)–tacn units. Complex C1 features a single μ-hydroxo bridge between the two copper(II) centers, which mediates strong antiferromagnetic coupling between the metal centers. Complexes C2 and C3 cleave
三个新的金属配位配体L 1 ·4HCl [1-(2-胍基乙基)-1,4,7-三氮杂环壬烷四盐酸盐],L 2 ·4HCl [1-(3-胍基丙基)-1,4,7-三氮杂环壬烷四氯化氢]和L 3 ·4HCl [1-(4-胍基丁基)-1,4,7-三氮杂环壬烷四盐酸盐]是通过用乙基胍对1,4,7-三氮杂环壬烷(tacn)进行选择性N-官能化而制得的,分别是丙基胍和丁基胍的侧基。L 1 ·4HCl与Cu(ClO 4)2 ·6H 2 O在碱性水溶液中的反应导致单羟基桥连的双核铜(II)配合物[Cu 2 L 1 2(μ-OH)](ClO 4)3 ·H 2 O(C1),而对于L 2和L 3,组成为[Cu(L 2 H)Cl 2 ] Cl·(MeOH)0.5 ·(H从甲醇和DMF溶液中分别结晶出2 O)0.5(C2)和[Cu(L 3 H)Cl 2 ] Cl·(DMF)0.5 ·(H 2 O)0.5(C3)。X射线晶体学分析表明,除了来自L