Details of the synthesis and physical properties of H2NCH2CH2O•GaMe2 are given. The compound crystallizes in the tetragonal space group P43, a = 12.2771(2), c = 9.7345(4) Å, Z = 8. The structure was solved by Patterson and Fourier syntheses and was refined by fullmatrix least-squares procedures to a final R value of 0.028 and Rw of 0.036 for 1378 reflections with I ≥ 3σ(I). The structure consists of monomeric molecules containing tetrahedrallycoordinated gallium atoms. Molecules are linked by an extensive network of N—H … O hydrogen bonds. Bond lengths (corrected for libration) are: Ga—O, 1.916(5) and 1.917(4), Ga—N, 2.056(6) and 2.072(6), and Ga—C, 1.962–1.974(8–9) Å.

. Can. J. Chem. 59,996 (1981). The synthesis of novel allylic derivatives of Ni and Pd incorporating the bispyrazolylgallate ligand Me,Ga(N,C,H,),-is described. Pyrazolyl-bridged homobinuclear and trinuclear nickel allyl systems are also presented. Crystal structures of

. Can. J. Chem. 57, 3090 (1979).A series of neutral pyrazolyl-bridged nickel nitrosyl complexes, [LNi(NO)], (where L = pyrazolyl, N2C3H3; 3,5-dimethylpyrazolyl, N,C5H7; or 3,5-di-tert-butylpyrazolyl, N2Cll-HI,), is described. The nickel atoms are susceptible to nucleophilic attack and the reactivity of the dimers with neutral donor ligands is reported. In addition to the dimeric molecules a novel trimetallic nickel compound [(ON)Ni(N2C5H7)2]2Ni has also been isolated. Introduction In our continuing study of pyrazolyl-based ligands (1, 2) our attention has recently been focused on a series of pyrazolyl metal nitrosyl compounds containing bridging bidentate pyrazolyl moieties. The ligating properties of bridging pyrazolyl groups have been reviewed by Trofimenko (3) and recent reports reflecting the current interest in this type of bridging

. Can. J. Chem. 57,3119(1979).The synthesis and characterization of two 3,5-dimethylpyrazoly1 metal dinitrosyl dimers [(N2CSH7)M(N0)2]2 (where M = Fe or Co) are described and their X-ray crystal structures detailed. Both complexes crystallize in the monoclinic space group C2/c, a = 23.848(2),

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.