Coordination compounds containing a novel tridentate pyrazolylgallate ligand. X-ray structures of Me₂Ga(μ-OH)(μ-Me₂pz)GaMe₂•HOCH₂Me₂pz and [Me₂Ga(pz)(OCH₂pz)]₂Ni (pz = N₂C₃H₃)

Abstract

. Can. J. Chem. 66, 101 (1988). The syntheses of the novel anionic tridentate dimethyl(pyrazol-l-yl)(l-oxymethylpyrazolyl)gallate ligand and representative transition metal complexes thereof are reported. The direct reaction of Me3Ga with 1-hydroxymethyl-3,5-dimethylpyrazole leads to the isolation of Me2Ga(p-OH)(p-Me2pz)GaMe2.HOCH2Me2pz. Crystals of (p-hydroxy)(p-3,5-dimethylpyrazolyl)bis(dimethylgaIlium) I-hydroxymethyl-3,5-dimethylpyrazole solvate are monoclinic, a = 33.105(2), b = 7.3048(7), c = 8.8336(6) A, P = 97.474(7)", Z = 4, space group P2,/rz, and those of bis[dimethyl(pyrazol-l;yl)(l-oxymethylpyrazolyl)gallato-N',~2', OInickel(11) are monoclinic, a = 9.6345(3), b = 14.273 1 (6), c = 18.6356(7) A, P = 99.660(3)", Z = 4, space group P 2 1 / c . Both structures were solved by conventional heavy atom methods and were refined by full-matrix least-squares procedures to R = 0.044 and 0.037 for 2660 and 3904 reflections with I 2 3u(I), respectively. Mean bond lengths in Me2Ga(p-OH)(p-Me2pz)GaMe2.HOCH2Me2pz are Ga-0 = 1.918(1 I), Ga-N = 2.001(5), and Ga-C = 1.955 (5) [Traduit par la revue]

Late-Metal Nitrosyl Cations: Synthesis and Reactivity of [Ni(NO)(MeNO2)3][PF6]

“…In solution, 1 exhibits a high ν NO absorption feature in its IR spectrum (1877 cm –1 , CH 2 Cl 2 ). This ν NO value is higher than those observed for previously reported nickel nitrosyls (1568–1867 cm –1 ) ,− and can be attributed to the weak Lewis basicity of CH 3 NO 2 and its overall cationic charge . In contrast, this value is lower than that of [Cu(CH 3 NO 2 ) 5 (NO)][PF 6 ] 2 (1933 cm –1 , CH 3 NO 2 ) .…”

Organometallic compounds of Group 13 elements containing the ligand C(SiMe3)2(SiMe2C5H4N-2)

“…The Ga-N [2.047(5) Å ] and Ga-C bond lengths [2.008(5) Å ] in 3 are within the reported ranges [Ga-N 2.013(2)-2.092(5) Å and Ga-C 1.936(6)-2.013(7) Å [15,16,23]] and close to the values [Ga-N 2.057(4), Ga-C 2.000(4) Å ] found for the compound GaCl 2 C(SiMe 3 ) 2 (SiMe 2 NMe 2 ) (5c) [13]. The Ga-O distance in 3 [2.099(4) Å ] is a little longer than the sum of the covalent radii (1.93 Å ) and at the upper end of the range found in organogallium hydroxides [1.892(5)-2.033(5) Å ] [11,21,24]. The Ga-Br distance [2.4028(9) Å ] is likewise longer than the sum of the covalent radii (2.34 Å ) and Ga-Br(terminal) distances [2.300(1)-2.311(2) Å ] found in organogallium compounds containing the GaBr 4 fragment [25].…”