Second sphere coordination in fluoroanion binding: Synthesis, spectroscopic and X-ray structural study of [Co(phen)2CO3](Pfbz)·6H2O |
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| Authors: | Ajnesh Singh Thammarat Aree |
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| Affiliation: | a Department of Chemistry, Panjab University, Chandigarh 160014, India
b Department of Chemistry, Faculty of Science, Chulalongkorn University, Phyathai Rd., Pathumwan, Bangkok 10330, Thailand |
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| Abstract: | To explore the anion receptor potential of [Co(phen)2(CO)3]+ for the pentafluorobenzoate ion, [Co(phen)2(CO)3](Pfbz)·6H2O (where phen = 1,10-phenanthroline and Pfbz = pentafluorobenzoate) was synthesized by reacting appropriate salts in aqueous medium. A detailed packing analysis has been undertaken to delineate the role of second sphere C-H?F interactions amid other heteroatom interactions. The complex salt has been characterized by elemental analyses, spectroscopic studies (IR, UV/Vis, multinuclear NMR) and solubility product measurement. The complex salt crystallizes in the monoclinic crystal system with space group P21/n having the cell dimensions a = 13.377(3) Å, b = 17.204(3) Å, c = 15.408(3) Å, β = 108.11(3)°, V = 3370.1(12) Å3 and Z = 4. Single crystal X-ray structure determination revealed ionic structure consisting of complex cation, [Co(phen)2(CO)3]+, Pfbz anion and six lattice water molecules. In the crystal lattice, discrete ions [Co(phen)2CO3]+ are forming rectangular voids in which the Pfbz anions are entrapped. Crystal lattice is stabilized by electrostatic forces of attraction and hydrogen bonding interactions, i.e. O-H?O, C-H?O, and C-H?F, involving second sphere coordination besides π?π interactions. |
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| Keywords: | Cobalt(III) Second sphere coordination chemistry 1,10-Phenanthroline Pentafluorobenzoate X-ray crystallography |
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