951009-03-3Relevant academic research and scientific papers
New coordination modes of substituted benzohydroxamic acid with dialkyltin(IV): Structural diversity through ligand isomerization
Shang, Xian-Mei,Wu, Ji-Zhou,Li, Qing-Shan
, p. 4143 - 4150 (2006)
When R2SnCl2 (R = Me, nBu) reacted with substituted benzohydroxamic acid (substituent = 4-F; 2,4-Cl2; 2,5-F2) and potassium hydroxide in aqueous methanol solution, two types of condensation products could be obtained, depending on the molar ratio R2SnCl 2/RCONHOH/KOH. When a 1:1:2 molar ratio was used, 1:1 alkyltin hydroxamates {(n-C4H9)2Sn[4-FC 6H4C(O)NO]}n (1) and {(CH3) 2Sn[2,5-F2C6H3C(O)NO]}n (2) were formed. When a 1:2:2 ratio was used, another two unexpected 2:3 alkyltin hydroxamates, {(CH3)4Sn2[(2,4-Cl 2C6H3C(O)NHO)2][2,4-Cl 2C6H3C(O)NO]}n (3) and {(n-C 4H9)4Sn2[(4-FC6H 4C(O)NHO)2][4-FC6H4C(O)NO]} n (4), were obtained. All these complexes were characterized by elemental analysis, IR, 1H, 13C, 119Sn NMR spectra and X-ray diffraction analysis. The results indicated overall (Z)-iminol coordination mode in the hydroximic tautomeric form for 1 and 2, and keto-iminol mixed-coordination mode including both in (Z)-hydroxamic and -hydroximic tautomeric forms for 3 and 4. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.
