title: Tripropyltin(iv) complexes with some selected bioligands in 50% v/v dioxane/water mixture.
abstract: The interaction of the tri-n-propyltin(IV) (TPT) with some selected bioligands having a variety of model functional groups were investigated using potentiometric technique at 25 degrees C and 0.1 M ionic strength in 50% v/v dioxane/water mixture. TPT is hydrolyzed to give [(C3H7)3SnOH], [(C3H7)3Sn(OH)2]-, and [((C3H7)3Sn)2OH]+. Amino acids and DNA constituents form 1:1 and 1:2 complexes. Peptides form 1:1 complexes and the corresponding deprotonated amide species. The protonated complexes are formed with amino acids, peptides and some DNA constituents. The hydrolysis constants and the stepwise formation constants of the complexes formed in solution were calculated using the nonlinear least-square program MINIQUAD-75. The participation of different ligand functional groups in binding to organotin is discussed. The speciation diagrams of the various complex species were evaluated as a function of pH.
authors.affiliation: Department of Applied Sciences, Faculty of Technological Studies, PO Box 42325, 70654 Shuwaikh, Kuwait.
authors.forename: Abdul Aziz
authors.initials: AA
authors.lastname: Al-Najjar
authors.forename: Mahmoud M A
authors.initials: MM
authors.lastname: Mohamed
authors.forename: Mohamed R
authors.initials: MR
authors.lastname: Shehata
authors.forename: Mohamed M
authors.initials: MM
authors.lastname: Shoukry
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D001665:Binding Sites; D004247:DNA / Q000737:chemistry; D004146:Dioxanes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D016018:Least-Squares Analysis; D008024:Ligands; D017711:Nonlinear Dynamics; D009994:Osmolar Concentration; D010455:Peptides / Q000737:chemistry; D011199:Potentiometry; D011522:Protons; D014220:Trialkyltin Compounds / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D000596:Amino Acids; D004146:Dioxanes; D008024:Ligands; D010455:Peptides; D011522:Protons; D014220:Trialkyltin Compounds; D014867:Water; D004247:DNA