Benzenoid-quinoid tautomerism of azomethines and their structrual analogues XXX. Molecular structure of gallium and boron organometalic compounds with tautomeric azomethines

Structure Investigations of Group 13 Derivatives of N-Phenylsalicylideneimine

“…It is worth noting that the crystals of 1 and 2 are isostructural, which indicates that the nature of the metal center does not affect the molecular assembly of the tetrahedral aluminum and gallium complexes derived from N-phenylsalicylideneimine. Interestingly, our analysis of intermolecular contacts in the related structure of (N-methylsalicylideneiminato)dimethylgallium, [Me 2 Ga(saldMe)], 27 shows that the replacement of the N-phenyl with an N-methyl group in the bidentate salicylideneiminate ligand leads to significant changes in the molecular assembly of the tetrahedral R 2 M(O,N) complex (the arrangement of molecules in the crystal structure of Me 2 Ga(saldMe) is determined, as in compounds 1 and 2, by the C-H imino ‚‚‚O interactions and result in the formation of infinite H-bonded chains assembled by weak C-H‚‚‚π(Ph) interactions into the double layers without guest molecules). However, this issue will be discussed in detail together with our comprehensive analysis of the hydrogen-bond supramolecular structures of group 13 metal Schiff base complexes based on the Cambridge Structural Database.…”

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

“…Each ligand chelates a gallium atom via the bridging phenolic-oxogen atom and the nitrogen atom, forming five-membered chelate ring'Ga(1)-O(1)-C(1)-C(6)-N(1)'.The gallium atom is fivecoordinate with two methyl carbon atoms, two bridging oxygen atoms and a nitrogen atom. The Ga(1)-O(1) distance (1.911(2) Å ) is comparable to that in dimethylgallium N-methylsalicylaldiminate (1.904(7) Å )[17] and dimethyl(2-hydroxybenzaldehydato)gallium (1.927(3) Å )[18], just belonging to covalent bonds, whereas the + Ga(CH3 …”

“…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.…”

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].…”