Adduct of mononuclear and dinuclear citrate zinc complex [Zn(Hcit)(phen)(HO)][Zn(Hcit)(phen)(HO)]·13.5HO () and its aggregate [Zn(Hcit)(phen)]·14nHO () (Hcit = citric acid, phen = 1,10-phenanthroline) were synthesized in weak acidic solutions. The former was obtained from the reaction of zinc nitrate, citric acid and phenanthroline in a molar ratio of 3 : 2 : 3, while a slightly excess of phenanthroline results in the formation of the polymeric product in a molar ratio of 3 : 2 : 4. Transformation of to was finished by the reaction of with an equimolar of phenanthroline in 72% yield. Reverse conversion of to is obtained in 77% yield, showing an equilibrium between and . Neutral compound consists of one monomeric anionic unit [Zn(Hcit)(phen)(HO)] and one dimeric cationic unit [Zn(Hcit)(phen)(HO)] that connect each other by strong hydrogen bonds [O6⋯O4w 2.636(2); O7⋯O3w 2.630(3) Å]. In , the citrate ligand links each trinuclear unit [Zn(Hcit)(phen)] to generate an infinite 1D chain that extents into a 3D supramolecular structure by intra- and inter-molecular hydrogen bonds. Moreover, and exhibit strong fluorescence at room temperature.
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| http://dx.doi.org/10.1016/j.inoche.2009.04.028 | DOI Listing |
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