Synthesis and structural characterisation of unprecedented primary N-nitrosamines coordinated to iridium(iv).

The redox chemistry of the N-nitrosamine complexes [IrCl5(RN(H)N[double bond, length as m-dash]O)]2- (R = benzyl or n-butyl) was studied in detail. One-electron oxidations at around 200 mV vs. ferrocene/ferrocenium were reversible in cyclic voltammograms.

Dimerization, redox properties and antioxidant activity of two manganese(III) complexes of difluoro- and dichloro-substituted Schiff-base ligands.

Two mononuclear Mn complexes [Mn(3,5-Fsalpn)(HO)][B(CH)]·2HO (1·2HO) and [Mn(3,5-Clsalpn)(OAc)(HO)]·HO (2·HO), where Hsalpn=1,3-bis(salicylidenamino)propane, have been prepared and characterized. The crystal structure of 1·HO shows that this complex forms μ-aqua dimers with a short Mn⋯Mn distance of 4.93Å.

Halide coordinated homoleptic [Fe4S4X4](2-) and heteroleptic [Fe4S4X2Y2](2-) clusters (X, Y = Cl, Br, I)--alternative preparations, structural analogies and spectroscopic properties in solution and solid state.

New facile methods to prepare iron sulphur halide clusters [Fe4S4X4](2-) from [Fe(CO)5] and elemental sulphur were elaborated. Reactions of ferrous precursors like tetrahalidoferrates(ii) or simple ferrous halides with [Fe(CO)5] and sulphur turned out to be efficient methods to prepare homoleptic [Fe4S4X4](2-) (X = Cl, Br) and heteroleptic clusters [Fe4S4X4-nYn](2-) (X = Cl, Br; Y = Br, I). Solid materials were obtained as salts of BTMA(+) (= benzyltrimethylammonium); the new compounds containing [Fe4S4Br4](2-) and [Fe4S4X2Y2](2-) (X, Y = Cl, Br, I) were all isostructural to (BTMA)2[Fe4S4I4] (monoclinic, Cc) as inferred from synchrotron X-ray powder diffraction.

5-Hy-droxy-3-methyl-5-phenyl-4,5-di-hydro-1H-pyrazole-1-carbothio-amide.

In the title compound C(11)H(13)N(3)OS, the aromatic ring and the dihydro-pyrazole ring are oriented orthogonally with respect to each other, making a dihedral angle of 89.92 (9)°. An intra-molecular O-H⋯S hydrogen bond occurs.

Chloro-bis-(naphthalen-1-yl)phosphane.

In the title compound, C(20)H(14)ClP, the dihedral angle between the naphthyl rings is 81.77 (6)°. The crystal packing suggests weak π-π stacking inter-actions between the naphthyl rings in adjacent units [minimum ring centroid separation 3.

N-butylpyridinium undecachlorocarbadodecaborate and comparison with similar compounds.

The title compound, C(9)H(14)N(+)·CHB(11)Cl(11)(-), was obtained in the course of our continuing studies of the low-melting salts of closo- and nido-carborane cage anions with alkylpyridinium and dialkylimidazolium cations. The title compound is the first example of a pyridinium salt of a perchlorinated carborane anion. The structure consists of one N-butylpyridinium cation counterbalanced by one perchlorinated carborane cage anion per asymmetric unit.