Solution and cross-polarization/magic angle spinning NMR investigation of intramolecular coordination SnN in some organotin(IV) C,N-chelates

• Published in: Inorganica Chimica Acta 2001-10, Vol.323 (1), p.163-170
• Main Authors: Růžička, Aleš, Jambor, Roman, Brus, Jiřı́, Cı́sařová, Ivana, Holeček, Jaroslav
• Format: Article
• Language: English
• Subjects: C,N-chelates; Intramolecular interaction; NMR spectroscopy; X-ray diffraction
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/S0020-1693(01)00596-5

An intramolecular donor/acceptor SnN bonding connection in a set of triphenyl- and diphenyl-(halogeno)tin(IV) C,N-chelates, Ph 2XSnL, where Ph=C 6H 5, X=Ph, Cl or Br and L 1=2-(dimethylaminomethyl)phenyl-, C 6H 4(CH 2NMe 2)-2, and L 2=2,6-bis[(dimethylaminomethyl)phenyl]-, C 6H 3(CH 2NMe 2) 2-2,6, respectively, was studied by 119Sn, 15N, 13C and 1H NMR spectroscopy in solution of non-coordinating solvent (CDCl 3) and by 119Sn cross-polarization/magic angle spinning NMR techniques in the solid-state. The existence of SnN coordination bonds was confirmed in studied compounds and their strengths were evaluated through the values of NMR spectra parameters of nuclei directly involved in SnN connection, namely by characteristic changes of chemical shifts δ( 119Sn) and δ( 15N) and values of J( 119Sn, 13C) and J( 119Sn, 15N) coupling constants. The set was extended by compound [2,6-C 6H 3(CH 2NMe 2) 2]PhSnCl 2 ( 5a), that is the decomposition product of compound [2,6-C 6H 3(CH 2NMe 2) 2]Ph 2SnCl ( 5). This 5a was characterized by NMR spectroscopy and its structure was estimated by X-ray diffraction techniques. An intramolecular SnN connection in a set of triphenyl- and diphenyl(halogeno)tin(IV) C,N-chelates (C 6H 4(CH 2N(CH 3) 2)-2, and C 6H 3(CH 2N(CH 3) 2) 2-2,6) was studied by NMR spectroscopy in solution and solid-state. The existence of SnN coordination bonds was evaluated through the values of NMR spectra parameters of nuclei directly involved in SnN connection. The compound [2,6-C 6H 3(CH 2N(CH 3) 2) 2](C 6H 5)SnCl 2 was characterized by X-ray diffraction techniques.