Brown Asha, Lang Thomas, Mullen Kathleen M, Beer Paul D
Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK.
Org Biomol Chem. 2017 May 31;15(21):4587-4594. doi: 10.1039/c7ob01040k.
An active metal template strategy was used to synthesise a neutral indolocarbazole containing [2]rotaxane anion host system. H NMR anion binding investigations reveal that the [2]rotaxane recognises a range of monoanions in acetone-d : DO 95 : 5 with an unusual interlocked host selectivity for acetate and dihydrogenphosphate oxoanions over halides. The rotaxane displays an overall selectivity for the sulfate dianion, favouring a 2 : 1 host : guest binding stoichiometry at low sulfate concentration and a 1 : 1 stoichiometry in the presence of excess sulfate. Fluorescence titration demonstrates that the [2]rotaxane is also capable of sensing guest anions via significant changes in its emission spectrum.
采用活性金属模板策略合成了一种含[2]轮烷阴离子主体体系的中性吲哚并咔唑。1H NMR阴离子结合研究表明，[2]轮烷在丙酮-d6∶D2O 95∶5中识别一系列单阴离子，对乙酸根和磷酸二氢根氧阴离子具有不同于卤化物的异常互锁主体选择性。轮烷对硫酸根二阴离子表现出总体选择性，在低硫酸根浓度下有利于2∶1的主体∶客体结合化学计量比，在过量硫酸根存在下为1∶1化学计量比。荧光滴定表明，[2]轮烷还能够通过其发射光谱的显著变化来传感客体阴离子。
