Brown Asha, Mennie Katrina M, Mason Owen, White Nicholas G, Beer Paul D
Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK.
Dalton Trans. 2017 Oct 10;46(39):13376-13385. doi: 10.1039/c7dt02832f.
Neutral heteroditopic [2]rotaxane ion-pair host systems were synthesised via a Cu(ii) directed passive metal template strategy. Each rotaxane contains discrete, axle-separated interlocked binding sites for a guest anion and a transition metal countercation. The anion binding sites are composed of convergent X-H (X = C, N) hydrogen bond donor groups, or mixed X-H and C-I hydrogen and halogen bond donor groups, whereas an equivalent three-dimensional array of amine, pyridine and carbonyl oxygen donor groups comprise the transition metal binding site. H NMR titrations experiments in CDCl/CDOD or CDCl/CDOD/DO solvent mixtures reveal that the heteroditopic [2]rotaxane host systems are capable of cooperative anion recognition in the presence of a co-bound Zn(ii) cation.
通过铜（II）导向的被动金属模板策略合成了中性异二聚体[2]轮烷离子对主体体系。每个轮烷包含用于客体阴离子和过渡金属抗衡阳离子的离散的、轴分离的互锁结合位点。阴离子结合位点由收敛的X-H（X = C、N）氢键供体基团，或混合的X-H和C-I氢键及卤键供体基团组成，而胺、吡啶和羰基氧供体基团的等效三维阵列构成过渡金属结合位点。在CDCl₃/CD₃OD或CDCl₃/CD₃OD/D₂O溶剂混合物中的¹H NMR滴定实验表明，在共结合的锌（II）阳离子存在下，异二聚体[2]轮烷主体体系能够协同识别阴离子。
