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Strong hydrogen bond-mediated complexation of H2PO4− by neutral bis-thiourea hosts

✍ Scribed by Philippe Bühlmann; Seiichi Nishizawa; Kang Ping Xiao; Yoshio Umezawa

Publisher
Elsevier Science
Year
1997
Tongue
French
Weight
631 KB
Volume
53
Category
Article
ISSN
0040-4020

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✦ Synopsis

Highly preorganized his-thiourea receptors based on a xanthene spacer selectively (HzP04-> CH3COO-> Cl-) bind dihydrogenphosphate via multitopic hydrogen bonding, giving stronger complexes with H2PO4. than any synthetic neutral receptor known so far. The high complexation strengths are rationalized by the hydrogen bond donor strength of the thiourea groups and by host preorganization. The hydrogen bond acceptor strengths of the guest anions and, for small ions, guesl salvation explam the observed sclcctivity of complexation in dimcthyl sulfoxide (DMSO).

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