Metallosupramolecular helices constructed from nickel(II) and multidentate “click” triazole ligands
作者:Uttam R. Pokharel、Jordan C. Theriot、Frank R. Fronczek、Andrew W. Maverick
DOI:10.1016/j.poly.2020.114805
日期:2020.11
A series of binuclear metallosupramolecular helices [Ni2L3](4+) has been synthesized from Ni(II) salts and bis(bidentate) pyridyltriazole or aminomethyltriazole ligands, separated by ortho- (o-xpt and o-xamt, respectively), meta- (m-xpt, m-xamt), and para-xylylene (p-xpt, p-xamt) spacers. All complexes were characterized by elemental analysis, ESI-MS, and in four cases, the structures confirmed by X-ray crystallography. The xpt and xamt ligands, derived by "click" reactions, exhibit similar bonding behavior regardless of modifications in their coordination pockets and spacer groups, forming triple-helical binuclear complexes with pseudo-octahedral geometry at Ni. The crystallographically characterized complexes show shorter Ni center dot center dot center dot Ni separations with the ortho spacer ([Ni-2(o-xpt)(3)](4+), 9.332(2); [Ni-2(o-xamt)(3)](4+), 8.9718(10) angstrom) than with the para spacer ([Ni-2(p-xpt)(3)](4+), 11.574(2); [Ni-2(p-xamt)(3)](4+), 11.899(2), 11.924 (2) angstrom). (C) 2020 Elsevier Ltd. All rights reserved.