ANION RECOGNITION BY A DICOPPER(II) CRYPTATE

被引:46
作者
FABBRIZZI, L
PALLAVICINI, P
PARODI, L
TAGLIETTI, A
机构
[1] Dipartimento di Chimica Generale, Università di Pavia, I-27100 Pavia
关键词
ANION RECOGNITION; DIMETALLIC CRYPTATES; POLYAMINE CAGE COMPLEXES; INCLUSION COMPLEXES; COPPER COMPLEXES;
D O I
10.1016/0020-1693(95)04751-T
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The dicopper(II) complex of the bistren cage 1, in an aqueous solution buffered at pH = 8, incorporates polyatomic anions (NCO-, NCS-, N-3(-), SO42-, HCO3-, CH3COO-) according to a 1:1 stoichiometry. Log K values range over the 2-5 interval and show a sharp peak selectivity with respect to the anion 'bite', i.e. the distance between the two proximate donor atoms of each anion. The peak maximum lies at about 2.3 Angstrom, a bite length corresponding to the N-3(-) anion. Thus, the dicopper cryptate does not recognize anion size or coordinating tendencies, but simply recognizes the bite length. [GRAPHICS] ]
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页码:5 / 8
页数:4
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