A Comparison of the Self Assembled Frameworks of Three Cobalt(II) Coordination Compounds Bearing Dipicolinic Acid and Chelidamic Acid Ligands

Document Type

Article

Publication Date

10-1-2013

Department

Chemistry and Biochemistry

School

Mathematics and Natural Sciences

Abstract

A comparison of the self assembled lattice structures of unpublished coordination compound, [Co(dipic-OH)(OH2)3]·1.5H2O (I) (where dipic-OH = 4-hydroxypyridine-2,6-dicarboxylate anion) and two novel cobalt(II)-containing coordination compounds, [Co(dipic)(pyz)(OH2)]·0.25DMSO (II) (where dipic = dipicolinate anion and pyz = 2-(H-pyrazol-3-yl)-pyridine) and [Co(dipic-OH)(pyz)(OH2)]·H2O (III), have revealed remarkable distinctions in the hierarchy of their respective structures. The three dimensional (3-D) layered scaffold of compound I and the “zigzag” motifs of compounds II and III were found to have been created via unique hydrogen bonding patterns. Interestingly, compound III displayed a secondary 3-D channel framework, which was made possible by π–π stacking interactions. Spectroscopic studies yielded results that were consistent with the predicted behaviors of the various species of substituted ligands. X-ray crystallography revealed that compound I crystallized in the monoclinic space group C2/c with a = 14.734(3) Å, b = 6.8664(14) Å, c = 22.411(5) Å, α = 90°, β = 90.097(7)°, γ = 90°, V = 2267.4(8) Å3, Z = 8; compound II crystallized in the monoclinic space group P21/n with a = 11.621(3) Å, b = 12.391(3) Å, c = 12.537(4) Å, α = 90°, β = 102.148(11)°, γ = 90°, V = 1764.8(8) Å3, Z = 4; and compound III crystallized in the orthorhombic space group Pccn with a = 21.899(2) Å, b = 10.8845(11) Å, c = 15.7093(13) Å, α = 90°, β = 90°, γ = 90°, V = 3744.4(6) Å3, Z = 8.

Publication Title

Journal of Chemical Crystallography

Volume

43

Issue

10

First Page

509

Last Page

516

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