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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
Coordinatively polymeric and monomeric bismuth(III) complexes with pyridine carboxylic acids
O Anjaneyulu1, T K Prasad, K C Kumara Swamy
1School of Chemistry, University of Hyderabad, Hyderabad, 500046, AP, India.
Dalton Transactions (Cambridge, England : 2003)
|February 12, 2010
Summary
Researchers synthesized three novel bismuth compounds using readily available materials. These compounds exhibit diverse structures, including coordination polymers and a monomeric species, showcasing bismuth
Area of Science:
- Inorganic Chemistry
- Materials Science
- Crystallography
Background:
- Bismuth compounds are of interest due to their diverse applications.
- Understanding the structural diversity of bismuth coordination complexes is crucial for materials development.
- The synthesis of novel bismuth carboxylates provides insights into coordination chemistry.
Purpose of the Study:
- To synthesize and characterize novel crystalline bismuth compounds.
- To investigate the structural diversity and coordination environments of bismuth in these new compounds.
- To explore the chemical properties and potential applications of these bismuth complexes.
Main Methods:
- Synthesis of bismuth compounds using bismuth nitrate and organic acids (picolinic, dipicolinic, quinaldic acid) in aqueous medium.
- X-ray crystallography to determine the detailed structures of the crystalline compounds.
- Thermogravimetric analysis (TGA) to study thermal stability and the presence of water molecules.
Main Results:
- Three crystalline bismuth compounds were successfully synthesized: [Bi(pic)3]n, {Bi(dipic)[(HO2C)2C5H3N]}.H2O}n, and Bi(qa)2(NO3)(qaH).2H2O.
- The compounds exhibit varied structures: coordination polymers with tricapped trigonal prismatic and dodecahedral bismuth environments, and a monomeric species with dodecahedral bismuth.
- Compound [Bi(pic)3]n represents a new crystalline form, demonstrating structural flexibility during crystallization.
- Specific bonding motifs, including dimeric [Bi2O2] and trimeric [BiOCOBiOBiOCO] skeletons, were identified.
- Chelate ring formations involving carboxylate and nitrate ligands were elucidated.
- TGA confirmed the presence of non-coordinated water in two compounds.
- The synthesized compounds are insoluble in common solvents but soluble in dilute hydrochloric acid.
Conclusions:
- The study successfully synthesized and characterized three novel bismuth compounds with diverse structural architectures.
- The findings highlight the versatility of bismuth in forming coordination polymers and monomeric species with varying coordination geometries.
- The solubility in dilute HCl suggests potential for applications where acid-responsive behavior is desired.
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