pH-Induced switching of metal ion co-ordination: the structure of [Pd([18]aneN(2)S(4)center dot 2H(+))][BF4](4)center dot 2H(2)O from a twinned crystal ([18]aneN(2)S(4) = 1,4,10,13-tetrathia-7,16-diazacyclooctadecane)

摘要

Treatment of [Pd([18]aneN(2)S(4))][BF4](2) ([18]aneN(2)S(4) = 1,4,10,13-tetrathia-7,1 6-diazacyclooctadecane) with HBF4 led to a marked structural change at Pd(II) from distorted octahedral [N2S2 + S-2]-donation to a square-planar S-4-donor coordination via protonation of the secondary amine functions; this pH-induced re-arrangement is accompanied by a reversible colour change from purple to yellow in MeCN solution. [References: 9]