A Comparison of the Self Assembled Frameworks of Three Cobalt(II) Coordination Compounds Bearing Dipicolinic Acid and Chelidamic Acid Ligands
A comparison of the self assembled lattice structures of unpublished coordination compound, [Co(dipic-OH)(OH2)3]·1.5H2O (I) (where dipic-OH = 4-hydroxypyridine-2,6-dicarboxylate anion) and two novel cobalt(II)-containing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.
KeywordsCobalt complexes 2-(H-Pyrazol-3-yl)-pyridine Dipicolinic acid Chelidamic acid π–π Stacking Hydrogen bonding
This research was supported in part by an appointment to the Student Research Participation Program at the U.S. Army Engineer Research and Development Center, Construction Engineering Research Laboratory, administered by the Oak Ridge Institute for Science and Education through an interagency agreement between the U.S. Department of Energy and ERDC-CERL. This work was also supported by the Center Directed Research Program at the U.S. Army Corps of Engineers. This work was also supported by the Mississippi INBRE funded by an IDeA award from the National Institute of General Medical Sciences of the National Institutes of Health under grant number P20 GM103476.
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