Substituents make a difference: 6,6″-modified terpyridine complexes with helix configuration and enhanced emission
作者:Fan Fu、Die Liu、Lili Zhao、Huili Li、Xinyu Bai、Mingzhao Chen、Zhilong Jiang、Peiyang Su、Wanying Zhong、Yiming Li、Weiming Liao、Jun He、Pingshan Wang
DOI:10.1039/d2dt04006a
日期:——
hindrance of p-methoxyphenyl substituents endowed complexes L22-M with obvious longer coordination bond lengths and larger bond angles and dihedral angles compared with unmodified L12-M (L1: 4′-phenyl-2,2′:6′,2″-terpyridine). The chiral helix geometry was observed for L22-M, in which 2,2′:6′,2″-terpyridine moiety dramatically twisted to a spiral form in comparison to the nearly coplanar structure of the parent
一系列络合物L2 2 -M (L2: 6,6″-bis(4-methoxyphenyl)-4′-phenyl-2,2′:6′,2″-terpyridine, M: Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ )是通过配位对甲氧基苯基6,6″-取代的三联吡啶配体与第一排过渡金属离子合成的,并通过NMR、ESI-MS和X表征。 -射线单晶衍射技术。单晶结构表明,对甲氧基苯基取代基的空间位阻赋予配合物L2 2 -M与未修饰的L1 2 -M (L1: 4'-phenyl-2,2':6',2″-terpyridine)相比,具有明显更长的配位键长和更大的键角和二面角。观察到L2 2 -M的手性螺旋几何结构,其中 2,2':6',2″-三联吡啶部分与母体L1 2 -M的近共面结构相比显着扭曲成螺旋形式,导致丰富的分子内和分子间 π-π 相互作用。此外,在晶体中形成了6