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Supramolecular Assemblies of Nucleobase Derivative 1-Mecyt with Mg(II) and Ni(II) and Solid-State Transformation of Ni(II) Phase:  A Comprehensive Evidence of Their Different Reactivity toward 1-Mecyt [1-Mecyt = 1-Methylcytosine]

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posted on 04.04.2007, 00:00 by Teresa F. Mastropietro, Donatella Armentano, Nadia Marino, Giovanni De Munno, Jane Anastassopoulou, Theophilos Theophanides
The synthesis and crystal structure of the compounds [Mg(H2O)6(1-Mecyt)2]Cl2 (1), [Ni(H2O)6(1-Mecyt)2]Cl2 (2), and [Ni(1-Mecyt)2Cl2] (3) (where 1-Mecyt = 1-Methylcytosine) are reported. Compounds 1 and 2 consist of hexaaquo ions, 1-Mecyt molecules, and chloride ions self-assembled through an extended network of hydrogen-bonding interactions. Compound 3 is made of [Ni(1-Mecyt)2Cl2] units, with the 1-Mecyt molecules directly coordinated to the metal centers through the N(3) and O(2) atoms. When crystals of compound 2 are allowed to stand in air for 1 week, a solid transformation occurs. The results of our investigation clearly suggest that a solid-state reaction takes place in 2, leading to 3.