Intermolecular Binding Modes in a Novel [1 + 1] Condensation 1<i>H</i>-Pyrazole Azamacrocycle: A Solution and Solid State Study with Evidence for CO<sub>2</sub> Fixation
作者:Raquel Belda、Javier Pitarch-Jarque、Conxa Soriano、José M. Llinares、Salvador Blasco、Jesús Ferrando-Soria、Enrique García-España
DOI:10.1021/ic400645t
日期:2013.10.7
coordination leads to formation of 2:2 Cu2+:L dinuclear dimeric complexes in which the 1H-pyrazole units lose a proton behaving as bis(monodentate) bridging ligands. Unlike previously reported complexes of [2 + 2] pyrazole azamacrocycles, the pyrazolate units in 1 are pointing outward from the macrocyclic cavity to bind the Cu2+ ions. Inner coordination with formation of 1:1 Cu2+:L complexes is however observed
描述了由由亚甲基连接到1,5,9,13-四氮杂十二烷链的1 H-吡唑部分组成的新型环烷(L1)的合成。据我们所知,这是[1 + 1]缩合1 H-吡唑氮杂大环配体的第一个报道的合成方法。配合物[Cu 2(H(H – 1 L1))(H – 1 L1)](ClO 4)3 ·3.75H 2 O(1)和([Cu 2(H(H –1 L1)))0.5(H –1 L1)1.5 ]2(ClO 4)3 Br 2 ·4.2H 2 O(2)显示,Cu 2+配位导致形成2:2 Cu 2+:L双核二聚配合物,其中1 H-吡唑单元失去质子表现为双(单齿)桥配体。与先前报道的[2 + 2]吡唑氮杂大环化合物的络合物不同,1中的吡唑酸酯单元从大环腔向外指向以结合Cu 2+离子。内在协调形成1:1 Cu 2+然而,如[C L 2 ](ClO 4)2(3)的晶体结构所示,在[1 + 1]吡啶氮杂大环化合物中观察到:L络合物。[Cu