Recognition of phosphate monoester dianion by an alkoxide-bridged dinuclear zinc(II) complex |
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| Authors: | Kinoshita Eiji Takahashi Makoto Takeda Hironori Shiro Motoo Koike Tohru |
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| Institution: | Department of Functional Molecular Science, Graduate School of Biomedical Sciences, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima, 734-8551, Japan. kinoeiji@hiroshima-u.ac.jp |
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| Abstract: | Recognition of phosphate monoester dianion by an alkoxide-bridged dinuclear zinc(II) complex (Zn2L3+) has been studied (L = alkoxide species of 1,3-bisbis(pyridin-2-ylmethyl)amino]propan-2-ol). Potentiometric pH titration study disclosed a 1 : 1 phenyl phosphate complexation with Zn2L3+ in aqueous solution. The dissociation constant (= Zn2L3+]PhOPO3(2-)]/Zn2L3+-PhOPO3(2-)]) is an extremely small value of 2.5 x 10(-8) mol dm(-3) at 25 degrees C with I = 0.10 (NaNO3). The X-ray crystal analysis of the dizinc(II) complex with p-nitrophenyl phosphate showed that the phosphate dianion binds as a bridging ligand to the two zinc(II) ions. |
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