Abstract
Novel zinc thiodiacetate complex [Zn(tda)(H 2O)] n ( 1) ( tda = S ( CH 2 COO ) 2 2 - ) was obtained from the reaction of aqueous solutions of zinc dichloride with a 1:1 mixture of Na 2CO 3 and thiodiacetic acid. Complex 1 is a different hydrate compound with respect to the known species [Zn(tda)(H 2O) 3] · H 2O. The selective formation of 1 or [Zn(tda)(H 2O) 3] · H 2O can be achieved by controlling the crystallization conditions and it is even possible to interconvert the two hydrate compounds by fast or slow crystallization processes. The reaction of 1 with o-phenanthroline (phen) gave the dinuclear compound [Zn(tda)(phen)] 2 · 5H 2O ( 2), which was identified by X-ray analysis. The water crystallization molecules are interconnected by hydrogen bonds and they are aligned inside channels, which are parallel to the c-axis.
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