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Updated: Mar 10, 2026

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
Published on: June 8, 2022
Synthesis and structure of a binuclear calcium nitrate coordination complex with bridging zwitterionic nicotinic acid
Gulmira Burkitbaeva1, Zulfiya Djumanazarova1, Aysanem Bektursinova1
1Karakalpak State University, 1 Ch.Abdirov St. Nukus, 230112, Uzbekistan.
None:
The title coordination complex, bis-(μ-pyridin-1-ium-3-carboxyl-ato-κ2 O:O')bis-[di-aqua-bis-(nitrato-κ2 O,O')calcium(II)], [Ca2(C6H5NO2)2(NO3)4(H2O)4], was prepared from calcium nitrate and nicotinic acid in a water-ethanol solvent mixture. The asymmetric unit contains a half mol-ecule of the complex, with the calcium atom exhibiting a coordination number of eight, forming a distorted dodeca-hedral geometry with a mixed-ligand environment. The μ2-O,O' bridging zwitterionic nicotinic acid mol-ecules generate a centrosymmetric dinuclear complex. The extended structure features N-H⋯O, O-H⋯O and C-H⋯O hydrogen bonds, which generate a three-dimensional network. Hirshfeld surface and two-dimensional fingerprint plot analyses were performed to qu-antify and visualize the inter-molecular inter-actions contributing to the overall cohesion of the structure.
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