The solid-state structure of bis(pentafluorophenyl)zinc

Article Abstract:

Solid-state structure of bis(pentafluorophenyl)zinc has been investigated. It appears that a weak intermolecular C-F...Zn interaction exists between F(2) and an adjacent zinc center, based on close contact of 2.849(2) angstroms. The structure has near linear geometry for the two-coordinate zinc center, as is typical in monomeric ZnR2 derivatives. Stacking interactions exist in the crystal structure between C6F5 rings on adjacent molecules. Ring-centroid-to-ring-centroid distances were found to be 3.503 and 3.563 angstroms.

Molecular structure, Organometallic chemistry, Fluorocarbons, Zinc compounds, Borane

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Conformational isomers of 1,2,5,6-tetrathiocins and the photoisomerization of a 1,2,5,6-tetrathiocin into a 1,2,3,6-tetrathiocin: X-ray structures of (C6X4S2) (S = F, Cl) and C6F4SSSC6F4S

Article Abstract:

The 1,2,5,6-tetrathiocins (C6X4S2)2 , 3a, X = F, 3b, X = Cl, in high yields, are obtained by oxidation of dithiols 1,2-C6X4(SH)2, X = F,Cl, with I2 or So2Cl2, respectively. In solid state, 3a has the C sub 2h, or chair, shape. It crystallizes in two phases. On the other hand, 3b has a D sub 2 or twisted-boat structure. It crystallizes in the C2/c space group. Isomers 3a and C6F4SSSC6F4S have been investigated using 19F NMR, FTIR, and Raman spectroscopy and using EI mass spectrometry.

Usage, Observations, Conformational analysis, Crystals, Crystal structure, Isomerization

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Synthesis, electrochemistry, structure, and magnetic susceptibility of 5-tert-butyl-1,3-bis-(1,2,3,5-dithiadiazolyl)benzene: structural effect of the bulky substituent

Article Abstract:

The crystal structure of 5-tert-butyl-1,3-bis-(1,2,3,5-dithiadiazolyl)benzene is presented. The dithiadiazole rings form 4-member pinwheels around a 4-fold rotation-inversion axis. This creates a channel lined with sulfur atoms. Magnetic susceptibility studies suggest the crystal has an onset of paramagnetism 200 K lower than the parent compound.

Crystallization, Aromatic compounds

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