N,N-Ethylenebis(salicylideneimine) derivatives of gallium trimethyl: crystal and molecular structure of N,N-ethylenebis(salicylideneiminato) bis(dimethylgallium)

Abstract

Crystals of N,N-ethylenebis(salicylideneiminato)bis(dimethylgallium) are orthorhombic, a = 22.781(1), b = 9.4869(6), c = 19.700(2) Å, Z = 8, space group Pbca. The structure was solved by direct methods and was refined by full-matrix least-squares procedures to a final R of 0.036 and Rw of 0.029 for 2248 reflections with I ≥ 3σ(I). Details of the preparation and physical properties of (C16H14N2O2)(GaMe2)2 and (C16H15N2O2)(GaMe2) are given. The (C16H14N2O2)(GaMe2)2 molecule is approximately centrosymmetric in the solid state. A "GaMe2" unit is coordinated to each of the two salicylideneiminato moieties of the N,N-ethylenebis(salicylideneiminato) ligand. The gallium atoms have a distorted tetrahedral coordination geometry, with bond angles at gallium ranging from 92.7(1) to 124.6(3)°. Important bond lengths (corrected for libration) are: Ga—O, 1.886(2) and 1.884(2), Ga—N, 2.033(3) and 2.042(3), and weighted mean Ga—C, 1.959(9) Å.

Diorgano-gallium and -indium complexes with salen ligands: Synthesis, characterization, crystal structure and C–C coupling reactions

“…2. The geometric parameters for the orthorhombic form are in conformity with the one reported earlier by Trotter and co-workers [28].…”

“…In view to assess photophysical and catalytic properties of bi-and high-nuclearity organo-gallium and -indium complexes lacking oxo-bridges, we have chosen salen ligands, although a few organo-gallium and -indium complexes with these ligands have been reported earlier [28][29][30][31][32]. In this report we describe the preparation of organo-gallium and -indium complexes with salenH 2 and acenH 2 , their photophysical and catalytic properties and distortion isomerism in [Me 2 GaOC 6 H 4 CH@NCH 2 -] 2 .…”

Synthesis, characterization and luminescence study of dimethyl[2-(arylmethyleneimino)phenolato]gallium complexes: Crystal structure of dimethyl[N-(4-N,N′-dimethylamino) phenylmethyleneiminophenolato]gallium

“…1 with selected bond lengths and angles listed in Table 1 [19], bis(pyridine-2-methanolatodimethylgallium) (2.073(3) Å ) [20], just falling in the range of coordinate bonds. The Ga(1)-N(1) distance is 2.227(3) Å , slightly longer than those in complex N,N-ethylenebis(salicylideneiminato)bis[dimethylgallium] (2.026(3)-2.035(3) Å ) [21], [ t Bu 2 Ga(l-NHPh)] 2 (2.103(9) Å ) [17] and Me 3 GaNH 2 t Bu (2.12(1) Å ) [22]. The central four-member planar ring is constructed by two gallium atoms and two bridging oxygen atoms, which demonstrates that the dimeric species are formed by coordination of bridging oxygen to gallium between the two monomeric species.…”

“…In general, the EL emission bands will be similar to those of the photoluminescence emission spectra, [21] because the EL spectra are independent of the driving voltage and current. The result also indicates that the radiative recombination of injected electrons and holes takes place in the gallium complexes.…”

Synthesis, characterization and luminescence study of dialkyl[1-arylmethyleneimino-2-naphthonato]gallium complexes: Crystal structure of dimethyl[1-(2-pridyl) methyleneimino-2-naphthonato]gallium

“…The compound exists as a monomer in the solid state, in spite of quite a few dimethylgallium alkoxides and phenoxides were found to be dimeric with a planar Ga 2 O 2 ring [17][18][19]. Ga-O1 distance (2.002(4) Å ) in 1 is longer than those reported in N,N-ethylenbis(salicylideneiminato)[dimethylgallium] (1.869(2) and 1.874(2) Å , respectively) [20], dimethylgallium N-methylsalicylaldiminate (1.904(7) Å ) [21] and dimethylgallium[2-(N,N-dimethylaminomethyl)-4-methyl]phenoxide 1.890(4) Å ) [22]. The Ga-N distances (2.303(4) Å for Ga-N1 and 2.115(5) Å for Ga-N2 are also longer than those reported for Ga-N covalent and coordinative bond lengths as in (a-pyridyl)acetophenone Ga-N (2.027(2) Å ) [23], Me 3 GaNH 2 t Bu (2.12(1) Å ) [24] and dimethylgallium-[2-(N,N-dimethylaminomethyl)-4-methyl]-phenoxide (2.096(6) Å ) [22].…”