Previous work on a ditopic receptor based on a tripodal phosphine oxide core demonstrated preferential enhancement of bromide binding over chloride or iodide in the presence of lithium cation. Current studies on an elongated receptor provide evidence that preferential bromide binding enhancement in the presence of lithium cation is common to this receptor class in general, and that lengthening of the receptor results in an overall increase in halide association. Furthermore, the extended receptor shows a strong preference for Li+ binding in solution.
以前对基于三位氧化膦核心的二位受体进行的研究表明,在
锂阳离子存在的情况下,
溴化物的结合力优先于
氯化物或
碘化物。目前对一种加长型受体的研究证明,在
锂阳离子存在的情况下,
溴的结合优先增强是这类受体的共性,受体的加长会导致卤化物结合的整体增强。此外,加长的受体在溶液中显示出对 Li+ 结合的强烈偏好。