Solution and cross-polarization/magic angle spinning NMR investigation of intramolecular coordination SnN in some organotin(IV) C,N-chelates (original) (raw)
2001, Inorganica Chimica Acta
An intramolecular donor/acceptor Sn N bonding connection in a set of triphenyl-and diphenyl-(halogeno)tin(IV) C,N-chelates, Ph 2 XSnL, where Ph=C 6 H 5 , X=Ph, Cl or Br and L 1 = 2-(dimethylaminomethyl)phenyl-, C 6 H 4 (CH 2 NMe 2)-2, and L 2 =2,6-bis-[(dimethylaminomethyl)phenyl]-, C 6 H 3 (CH 2 NMe 2) 2-2,6, respectively, was studied by 119 Sn, 15 N, 13 C and 1 H NMR spectroscopy in solution of non-coordinating solvent (CDCl 3) and by 119 Sn 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 l(119 Sn) and l(15 N) and values of J(119 Sn, 13 C) and J(119 Sn, 15 N) coupling constants. The set was extended by compound [2,6-C 6 H 3 (CH 2 NMe 2) 2 ]PhSnCl 2 (5a), that is the decomposition product of compound [2,6-C 6 H 3 (CH 2 NMe 2) 2 ]Ph 2 SnCl (5). This 5a was characterized by NMR spectroscopy and its structure was estimated by X-ray diffraction techniques.