Substitution reactions of thorium(IV) acetate to synthesize nano-sized carboxylate complexes.
Some mixed-ligand thorium(IV) complexes with the general formula [Th(OOCCH(3))(4-n)L(n)] (L=anions of myristic, palmitic or stearic acid and n=1-4) have been synthesized by the stepwise substitution of acetate ions of thorium(IV) acetate with straight chain carboxylic acids in toluene under reflux. The complexes were characterized by elemental analyses, spectral (electronic, infrared, NMR and powder XRD) studies, electrical conductance and magnetic susceptibility measurements. Doubly and triply bridged coordination modes of the ligands were established by their infrared spectra and nano-size of the complexes by powder XRD. Room temperature magnetic susceptibility measurements revealed diamagnetic nature of the complexes. Electronic absorption spectra of the complexes showed pi-->pi*, n-->pi* and charge transfer transitions. Molar conductance values indicated the complex to be non-electrolytes. These are a new type of mixed-ligand thorium(IV) complexes for which a nano-sized, oxygen bridged polymeric structure has been established on the basis of physico-chemical studies.
Coordination Chemistry Research Laboratory, Department of Chemistry, DDU Gorakhpur University, Gorakhpur, Uttar Pradesh, India. drbpbaranwal@yahoo.com
Balram P
BP
Baranwal
Talat
T
Fatma
Anand
A
Varma
Alok K
AK
Singh
D000085:Acetates / Q000737:chemistry; D002264:Carboxylic Acids / Q000138:chemical synthesis* / Q000737:chemistry; D004583:Electrons; D009682:Magnetic Resonance Spectroscopy; D008280:Magnetics; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D010316:Particle Size; D011208:Powders; D013055:Spectrophotometry, Infrared; D013910:Thorium / Q000737:chemistry*; D014961:X-Ray Diffraction
D000085:Acetates; D002264:Carboxylic Acids; D009942:Organometallic Compounds; D011208:Powders; D013910:Thorium