Hydrazine complex, molecular

Fig. 42. (Left) Molecular structure of the hydrazine complex 83 in the crystal. (Right) Central N3Ni(/t-S)2(/ i,2-N2H4,)NiN -> core in 83. The figure was generated using data downloaded from The Cambridge Crystallographic Data Center (CCDC) and corresponds to the structure originally reported in Ref. (242).

Bidentate Schiff base complexes exhibit interesting properties of catalytic oxidation of hydrazine with molecular oxygen, with high heat effects in many cycles (16-17) according to the Scheme 1. 

Tricarbonyl(vinylketene)iron(0) complexes were shown to react with dimethyl maleate, dimethyl fumarate, ( )-methyl 4-oxopent-2-enoate and ( )-ethyl 4,4,4-trifluorobut-2-enoate to give decarbonylated adducts. " New (77 -azadiene)Fe(CO)3 complexes containing furan, thiophene or ferrocenyl moieties at the G terminus of the heterodiene complexes have been prepared.X-ray crystal structures and extended Hiickel calculations of the new materials have been reported. Gomplexation of Fe2(GO)9 with iV,iV -bis(3-phenylallylidene)hydrazine in refluxing THF affords new ( 7" -azadiene)Fe(GO)3 complexes.Molecular structures of the new complexes have been confirmed by X-ray diffraction studies. 

Complex formation with flic substrate is the key stage of many catalytic processes. The formation of the following types of organometallic complexes is most typical in catalysis alkyl 7i-complexes, carbene complexes, n-complexes of substrates with the saturated bond (olefin, acetylene and allyl, complexes with carbon oxides), hydrazine complexes, and complexes with molecular oxygen and nitrogen. The structure of a ruthenium complex with CO2 obtained on the basis of an ab initio study is presented in Fig. 17.4. 

Uson, R., Laguna, A., Vdlacampa, M.D., Jones, P.G. and Sheldrick, G.M. (1984) Reactions of cis-diisocyanidebis (perfluorophenyl)gold(III) complexes with hydrazines. Crystal and molecular structure of bis(perfluorophenyl)[3-phenyl-l,4-bis(p-toluidino)-2,3-diazabut-l-en-l-yl-4-ylidene]gold. Journal of the Chemical Society, Dalton Transactions, (9), 2035-2038. 

Apart from complex formation involving metal ions (as discussed in Chapter 4), crown ethers have been shown to associate with a variety of both charged and uncharged guest molecules. Typical guests include ammonium salts, the guanidinium ion, diazonium salts, water, alcohols, amines, molecular halogens, substituted hydrazines, p-toluene sulfonic acid, phenols, thiols and nitriles. 

MoOCl2(PMe2Ph)3] reacts with 1,2-disubstituted hydrazines, PhCONHNHR, (R = Ph, 1-naphthyl, p-MeO-QH, p-Me QH4, or p-Cl-C H ) to give the red. diamagnetic crystalline molybdenum-arylimido-complexes (91). The full reports of the crystal and molecular structures of... 

Table VII shows that for cesium sorption, both KC1 and N H4 are significant for the two geologic solids studied. The negative values indicate that the presence of either KC1 or lowers sorption. Both appear to be competing with Cs+ ion for sorption sites. Competition between K+ and Cs+ ions for sorption sites on mica-like minerals is well known. However, displacement of Cs+ by hydrazine was surprising since N H, should exist mainly as a neutral species at pH 9-10. A small amount (0.0005M to 0.005M) will be protonated and apparently competes with Cs+. Ammonium ion is known to effectively compete with Cs+ for mineral sorption sites. Hydrazinium ion with a similar molecular structure should also displace Cs+. Since hydrazine will not reduce or complex Cs+, the only possible effects on cesium sorption is to compete for sorption sites or to alter the surface of the solid minerals. No evidence of surface alteration (change in color or texture) was observed. Therefore, it appears that an Eh buffer is not required for Cs+ sorption studies and hydrazine only interferes with the sorption reaction.

Three new molecular nitrogen complexes of Pd have been prepared from hydrazine sulphate.79 A yellow precipitate, formulated as the hydrazine-bridged dimer... 

Table I. Some Examples of Complexes of Molecular Nitrogen in the Initial Stages of Reduction Towards Ammonia or Hydrazine...

The preparation of the hexaammine complexes of ruthenium(II) and ruthenium (III) salts are sketchily described in the literature. The preparation of hexaammineruthenium(II) by the reduction of ruthenium trichloride with zinc in ammonia is described briefly by Lever and Powell.1 Allen and Senoff2 carry out the reduction using hydrazine hydrate. The hexaammineruthe-nium(III) cation is obtained by oxidation of the ruthenium(II) complex,1 and pentaamminechlororuthenium(III) dichloride is obtained by treating the former compound with hydrochloric acid.1,3 This compound may also be obtained by treating the pentaammine molecular nitrogen complex of ruthenium(II) with hydrochloric acid.2,4... 

Amines, hydrazines, and hydroxylamines. Amine complexes are known for tetravalent complexes of the earliest actinides (Th, U), particularly for the halides, nitrates, and oxalates. The complexes are generated either in neat amine, or by addition of amine to the parent compound in a nonaqueous solvent. Some of the known simple amine compounds are presented in Table 6. The molecular structure of ThCl4(NMe3)3 has been determined. The coordination environment about the metal is a chloride capped octahedron. A very limited number of adducts exist in which a tetravalent actinide is coordinated by a hydrazine or hydroxylamine ligand the parent compound is generally a halide or sulfate complex. Cationic metal hydrates coordinated with primary, secondary, or tertiary amines have also been isolated with acetylacetonate, nitrate, or oxalate as counterions. 

Elements of Group III The thermal decomposition of hydrazine-borane is a rather complex process, but the first stage appears to be a loss of molecular hydrogen. The major, final product may be formulated as (H2BNHNHBH2) .170... 

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