Color sense: 2-(Anthracen-9-ylethynyl)-1-methylbenzimidazole (BzIm-An) shows a ratiometric color change in emission from blue to light yellow to green with increasing Zn2+ concentration. The dimeric 3:1 complex [{(BzIm-An)3Zn2+}2] formed at low Zn2+ concentration is converted into the 2:1 complex [(BzIm-An)2Zn2+] at high concentrations of Zn2+.
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Ogawa et al. (2010) studied this question.
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