Articulo
Structure and thermal reactivity of Zn(II) salts of isocinchomeronic acid (2,5-pyridinedicarboxylic acid)
Registro en:
issn:1040-0400
issn:1572-9001
Autor
Sileo, Elsa E.
Piro, Oscar Enrique
Rigotti, Graciela
Blesa, Miguel Ángel
Suman de Araujo, Alexandre
Castellano, Eduardo Ernesto
Institución
Resumen
The synthesis, an improved refined crystal and molecular structure re-determination, and the thermal decomposition behavior of two Zn(II) derivatives of isocinchomeronic acid (2,5-pyridinedicarboxylic acid or H22,5-pydc) are presented. [Zn(2,5-pydc)(H2O)3Zn(2,5-pydc)(H2O)2]2 (1) crystallizes in the triclinic P-1 space group with a = 7.106(2), b = 11.450(2), c = 11.869(1) A, α = 107.29(1), β = 104.08(1), γ = 90.32(2)°, and Z = 2. [Zn(2,5-pydc)(H2O)2] · H2O (2) is orthorhombic (P212121 space group), with a = 7.342(1), b = 9.430(1), c = 13.834(2) A, and Z = 4. The structures were refined to agreement R; 1-factors of 0.0315 (1) and 0.0336 (2). Complex (1) is arranged as molecular Zn4(2,5-pydc)4(H2O)10 tetramers, the cages of which define channels that remain unblocked by anions. Compound (2) is polymeric with Zn(2,5-pydc)(H2O)2 and Zn(2,5-pydc)(H2O)3 units linked through bridging ligands. Both compounds were synthesized under mild conditions in aqueous media, without need to resort to hydrothermal media. Changing the pH from 4.51 to 5.75 suffices to direct the chemical processes toward the orthorhombic compound rather than to the triclinic one. Facultad de Ciencias Exactas