L. G. Kuz'mina

Basicity of transition metal carbonyl complexes: XVI. Reactions of η-cyclopentadienylmanganese complexes with mercury trifluoroacetate

Abstract Cyclopentadienyl manganese tricarbonyl, CpMn(CO) 3 , reacts with excess mercury trifluoroacetate in methylene chloride or in ether at 20°C, giving exhaustive mercuration of all five hydrogen atoms of the Cp ligand to give (CO) 3 MnC 5 (HgOCOCF 3 ) 5 . Conversely, the complex CpMn(CO) 2 PPh 3 in which the basicity of the metal is considerably higher due to the presence of the donor phosphine ligand, forms an adduct. The structure of the dimeric compound [CpMn(CO) 2 PPh 3 ·Hg(OCOCF 3 ) 2 ] 2 has been established by an X-ray study. The crystals are triclinic, cell parameters (at −120°C): a = 9.472(5), b = 9.369(7), c = 16.813(9) A, α = 92.06(5), β = 103.01(4), γ = 91.59(5)°, V = 1452(1) A 3 , Z = 2, space group P 1 .

Reaction of iron carbonyls with pyridazine-3,6-diones The structure of (1,2-dimethyl-1,2-dihydropyridazine-3,6-dione) iron tricarbonyl

Abstract Reaction of 1,2-dimethyl- and 1-methyl-2-phenyl-1,2-dihydropyridazine-3,6-diones (I) with iron carbonyls gives iron tetracarbonyl complexes (II), which are converted to iron tricarbonyls (III). The π-olefin structure of II has been confirmed by IR and PMr spectra. X-ray analysis of (1,2-dimethyl-1,2-dihydropyridazine-3,6-dione)iron tricarbonyl (IIIa) showed that the iron atom is bonded to the heterodiene fragment of the cycle including two carbon atoms of the double bond, the ketonic carbon atom and one nitrogen atom.

X-ray structural investigation of alkaloids VI. Crystal structure of the alkaloid parfumine

A complete x-ray structural investigation of the alkaloid parfumine has been performed. The lengths of the bonds and the valence angles have the usual values. Benzene rings A and D are planar, B a distorted half-chairC(6)HN, and rings C and E are flattened envelopes, EC(14) andC(19)E, respectively.

Molecular structure of cis-trifluoromethylmercury-bis(triphenylphosphine)trifluoromethylplatinum(II)

An x-ray structure study has shown that the CF3HgPt(CF3)[P(C6H5)3]2 molecule exists in cis configuration. The length of the Hg-Pt bond has been determined for the first time as 2.569(2) A.

X-ray structural investigation on alkaloids V. Crystal and molecular structure of sibiricine

SummaryA complete x-ray structural investigation of the spirobenzy1isoquinoline alkaloid sibiricine in the form of the base has been carried out. The bond lengths and valence angles are the usual ones.

Synthesis and structure of tetranuclear palladium(I) carbonyl clasters

Some palladium(I) carbonyl tetranuclear complexes were synthesized, which, based on the IR spectral and x-ray structure analysis data, contain two long and two short Pd-Pd bonds with two carbonyl and two carboxylate bridges.

Structure of the 2-mercapto-3-thenylidene-cyclohexylamine molecule in the crystalline state

The crystal structure of C11H14NS2 was determined by means of a diffractometric experiment (λ, MoKα, by the method of least squares within the anisotropic approximation, R =0.051 with respect to 1685 reflections). The crystals are monoclinic with a=14.953, b=12.663, c=6.222 Å, γ=91.69°, Z=4, and space group P21; the crystal cell contains two independent molecules having identical structures. The distribution of the bond lengths in the molecule provides evidence for the contribution of two tautomeric forms — 2-mercapto-3-thenylidenecyclohexylamine and 3-cyclohexylaminomethylenethiolene-2-thione — to the structure and for statistical delocalization of the H atom between the S and N atoms of the molecule.