A Comparison of the Self Assembled Frameworks of Three Cobalt(II) Coordination Compounds Bearing Dipicolinic Acid and Chelidamic Acid Ligands
Chemistry and Biochemistry
Mathematics and Natural Sciences
A comparison of the self assembled lattice structures of unpublished coordination compound, [Co(dipic-OH)(OH2)3]·1.5H2O (I) (where dipic-OH = 4-hydroxypyridine-2,6-dicarboxylate anion) and two novel cobalt(II)-containing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.
Journal of Chemical Crystallography
Rambaran, V. H.,
Erves, T. R.,
Ramsdale, S. E.,
Seymour, L. A.,
Cropek, D. M.,
Holder, A. A.
(2013). A Comparison of the Self Assembled Frameworks of Three Cobalt(II) Coordination Compounds Bearing Dipicolinic Acid and Chelidamic Acid Ligands. Journal of Chemical Crystallography, 43(10), 509-516.
Available at: https://aquila.usm.edu/fac_pubs/7845