3 resultados para co substitution
em Deakin Research Online - Australia
Resumo:
The reaction of 8-dimethylaminonaphthyllithium etherate with the tellurium(II) bis(dithiocarbamate) Te(S2CNEt2)2 provided the diaryltelluride (8-Me2NC10H6)2Te (1). The oxidation of 1 with an excess of H2O2 did not afford the expected diaryltellurium(IV) oxide (8-Me2NC10H6)2TeO (2), but the diaryltellurium(VI) dioxide (8-Me2NC10H6)2TeO2 (3). The preparation of 2 was achieved by the comproportionation reaction of 1 and 3. The protonation of 2 using triflic acid gave rise to the formation of diarylhydroxytelluronium triflate [(8-Me2NC10H6)2Te(OH)](O3SCF3) (4), which features the protonated diaryltellurium oxide [(8-Me2NC10H6)2Te(OH)]+ (4a). Compounds 1, 3·H2O·H2O2, 3·2H2O, and 4 were characterized by X-ray crystallography. The experimentally obtained molecular structures were compared to those calculated for 1–3, 4a, and (8-Me2NC10H6)2Te(OH)2 (5) as well as the related diphenyltellurium compounds Ph2Te (6), Ph2TeO (7), Ph2TeO2 (8), [Ph2Te(OH)]+ (9a), and Ph2Te(OH)2 (10) at the DFT/B3PW91 level of theory.
Resumo:
The reaction of tellurium tetrahalides, TeX
Resumo:
By reacting 2- and 3-aminobenzoic acids (HL1 and HL2, respectively), as well as 2-, 3- and 4-((E)-2-[4-(dimethylamino)phenyl]diazenyl)benzoic acids (HL3, HL4 and HL5, in this order) with a n-butyltin(IV) source [ n BuSn(O)OH or n Bu2SnO], the drum-type butylstannoxane complexes of general composition [ n Bu6Sn6O6(L n )6] [L n =L1 (1), L2 (2) and L3 (3)] and the ladder-type compounds [ n Bu8Sn4O2(L n )4] [L n =L3 (5), L4 (6) and L5 (7)] were obtained and fully characterized. By reacting 1 with 2-((E)-[4-(dimethylamino)benzylidene]amino)benzoic acid (HL6), a co-crystal (4) was achieved which comprises the metal complex aggregate found in 1 and the neutral HL6 molecule. The solution properties of the compounds were assessed from 1H and 13C NMR studies and, for the metal complexes, also from 119Sn NMR. The molecular structures of 1, 2, 4-7 were confirmed by single-crystal X-ray diffraction. Compounds 1-3 and the complex moiety of 4 display hexameric Sn6O6 clusters with drum-like structures, but 5-7 reveal Sn4O2 cores with ladder-type structural motifs. Besides the observed relationship between the ligand N-functional group and obtained (drum- or ladder-type) assemblies, the relative position of the carboxylate group in the ligand itself influences its coplanarity.