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Five-co-ordinated gallium(iir) and indium(ii1) complexes, GaCl[PhC(S)CHC(O)Ph],, GaCI(S,CNR,),

Bei der Redaktion eingegangen am 24. Oktober 1995.Inhaltsiibersicht. Die Darstellung von Tris(2,2,6,6-tetramethylpiperidino)indium 1 und von Bis(2,2,6,6-tetramethylpiperidino)indiumbromid 2 werden beschrieben. Beide Verbindungen wur- Monomeric Bis and Tris(amides) of IndiumAbstract. The synthesis of tris(2,2,6,6-tetramethylpiperidino)indium 1 and of bis(2,2,6,6-tetramethylpiperidino)indium bromide 2 are described. Both compounds were characterized by NMR and mass spectroscopy. They are monomeric in solution and gasphase. A crystal structure analysis of 1, also described in this work, proofs monomeric 1 in the solid state, too.

Tin, dichloro-, bis(thiobenz0ate) Indium(II1) and tin(1V) thiocarboxylates were prepared and characterized by X-ray crystallography which revealed a discharacterized on the basis of their IR, I3C-and l9Sn-NMR torted tetrahedral coordination at the In atom. X-ray diffracdata. Indium tris (thiobenzoate) (1) decomposes into a sulfido tion analysis of the complexes BuSn[ S(O)CPhl3 (4) and complex In(S)[S(O)CPh] (2a). The corresponding tris(thioace-C1,Sn[S(O)CPhI2 (7) showed distorted tetrahedral and cis-octate) In[ S(O)CMeI3 is thermally too unstable to be isolated. tahedral structures, respectively. The anionic tetrakis complex [Et3NH](In[S(0)CPh],) (3) was 5 6

Dispersion curves for the polyglycine I chain are calculated for both the in-plane and out-of-plane modes of vibration, and the force constants are fitted by comparison with observed infrared frequencies. Frequency distributions for polyglycine I and polyglycine II are calculated from inelastic neutron scattering. The intensity difference of the C–N torsional band between polyglycine I and polyglycine II suggests the presence of additional C–H···O-type hydrogen bonding between chains in the helical (II) form. An estimate of the sum of conformational and lattice energy difference in the two forms is made.