Crystal structure sulfur compounds

Fig. 3. Crystal structure of the compound C o(S8)2CS2 projected normal to the a-axis. Large cireles denote Coo, small eireles denote sulfur, black balls denote carbon. In this structure, the Coo-Ceo distanee is nearly 11 A, and the diameter of the Ceo molecule has been reduced relative to the other atoms for clarity [54].

The first X-ray crystal structure of a species containing an S-I bond was of the curious and unexpected cation [87 ]+ which was found in the dark-orange compound [S7l)+[SbF6] formed when iodine and sulfur react in SbF5 solution.The structure of the cation is shown in Fig. 15.22a and features an 87 ring with alternating 8-8 distances and a pendant iodine atom the conformation of the ring is the same as in 87, 8g, and 8sO (p. 696). The same cation was... 

A limited number of non-transition-metal derivatives of thiophene will be considered in this subsection. There are no short-range contacts between the lithium atoms originating from the (LiO)6 cores and the sulfur atoms in [Li—O—EMc2 (2-C4H3S)]6 (E = C, Si) (97OM5032), and evidence for Tr-interactions can be found in the X-ray crystal structures of these compounds. Theoretical computations show that a- (S ) Li" " interactions are weak, whereas Tr-Li" contributions are considerable, in accord with the general reasoning on the electronic characteristics of uncomplexed thiophene. 

An example of thione coordination is demonstrated with the thiocarbonyl donor ligand 2,6-dimethyl-4H-pyran-4-thione, that gives a complex with zinc chloride of the form ZnL2Cl2-The crystal structure shows the zinc is tetrahedrally coordinated by two chloride and two sulfur donors and the compound was further studied by 3H NMR and IR spectroscopy.573 Both monomeric and dimeric heterocyclic thione complexes have been formed with zinc.5 4,575... 

Lead is found as the sulfide, but the other members of the group also form compounds with sulfur. Although PbS has the sodium chloride crystal structure, a silicon sulfide having the formula SiS2 is known that has a chain structure ... 

Hydrides of variable composition are not only formed with pure metals as solvents. A large number of the binary metal hydrides are non-stoichiometric compounds. Non-stoichiometric compounds are in general common for d,f and some p block metals in combination with soft anions such as sulfur, selenium and hydrogen, and also for somewhat harder anions like oxygen. Hard anions such as the halides, sulfates and nitrides form few non-stoichiometric compounds. Two factors are important the crystal structures must allow changes in composition, and the transition metal must have accessible oxidation states. These factors are partly related. FeO,... 

Molecular sieves are crystalline metal aluminosilicates (1). Openings in their crystal structure permit passage of many gas constituents while preferentially adsorbing large, polar, or unsaturated compounds. Acid gas compounds may be adsorbed by certain types of molecular sieves. When used for H2S removal, the sieve is regenerated by a thermal swing cycle CL), being heated to release the H2S for downstream sulfur recovery. 

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