Sulfur—arsenic bonds

Trialkyl- and triarylarsine sulfides have been prepared by several different methods. The reaction of sulfur with a tertiary arsine, with or without a solvent, gives the sulfides in almost quantitative yields. Another method involves the reaction of hydrogen sulfide with a tertiary arsine oxide, hydroxyhahde, or dihaloarsorane. X-ray diffraction studies of triphenylarsine sulfide [3937-40-4], C gH AsS, show the arsenic to be tetrahedral the arsenic—sulfur bond is a tme double bond (137). Triphenylarsine sulfide and trimethylarsine sulfide [38859-90-4], C H AsS, form a number of coordination compounds with salts of transition elements (138,139). Both trialkyl- and triarylarsine selenides have been reported. The trialkyl compounds have been prepared by refluxing trialkylarsines with selenium powder (140). The preparation of triphenylarsine selenide [65374-39-2], C gH AsSe, from dichlorotriphenylarsorane and hydrogen selenide has been reported (141), but other workers could not dupHcate this work (140). 

Evidence for exchange of arsenic-carbon with arsenic-oxygen and arsenic-sulfur bonds, respectively, is obtained from the thermal dispor-portionation of methylarsenous oxide (143) according to Eq. (154), of phenyl-arsenous oxide according to Eq. (155), and of alkyl or arylarsenous sulfides according to Eq. (156). 

The four arsenic-sulfur bonds present in the FlAsH-tetracysteine complex rigidly lock the fluorophore to the peptide so that any rotational motion reflects that of the peptide or protein rather than the dye. This is in direct contrast to conventional coupling chemistries used to modify proteins in which the fluorophore is attached by a rotatable single bond to the flexible side chain of an amino acid. 

C. J. Sandroff et al.. Electronic Passivation of GaAs Surfaces Through the Eormation of Arsenic - Sulfur Bonds, Appl. Phys. Lett. 1989, 54(4), 362-364. 

Pig. 1. Diagram showing the forward half of the unit cube of binnite. Large circles represent sulfur atoms, small open circles copper atoms, and small shaded circles arsenic atoms. Bonds between adjacent atoms are indicated. Note that there are two kinds of copper atoms and two kinds of sulfur atoms. 

Element-element bonds, addition to G-G multiple bonds arsenic—selenium bonds, 10, 782 boron—boron bonds, 10, 727 boron—sulfur bonds, 10, 778 B-S and B-Ge bonds, 10, 758 chalcogen—chalcogen additions, 10, 752 germanium—germanium bonds, 10, 747 germanium-tin bonds, 10, 780 overview, 10, 725-787 phosphorus—phosphorus bonds, 10, 751 phosphorus—selenium bonds, 10, 782 phosphorus-sulfur bonds, 10, 781 Se-Si and Se-Ge bonds, 10, 779 silicon-germanium bonds, 10, 770 silicon-phosphorus bonds, 10, 780 silicon-silicon bonds, 10, 734 silicon-sulfur bonds, 10, 779 silicon-tin bonds, 10, 770 tin-boron bonds, 10, 767 tin-tin bonds, 10, 748... 

H. Preparation of Organoarsenic(lll) Compounds Containing Arsenic-Sulfur, -Selenium or -Tellurium Bonds... 

Oxidative addition of compounds having arsenic(III)-sulfur bonds by o-benzoquinones gives cyclic As(V)—S bonded compounds as shown in equation 357 °. 

Insertion into the basal P-P bond is also possible. For example, in the oxidative addition reaction of P4S3 to Vaska s compound, tra/ 5-Ir(CO)CI(PPh3)2 in benzene at 60 °C gives an octahedral Ir complex [Ir(CO)Cl(P4S3)(PPh3)]2 asagreen air-stable solid. Related reactions have been described. Metal centers can also be used to trap reactive arsenic-sulfur species (equation 73). 

Arsenic, Antimony and Bismuth Table 25 Bismuth-Sulfur Bond Lengths and Angles... 

These are cis-[Mn(CO) L SCN], cis-[Mn(CO) L2 SCN] and trans-[Mn(CO) L2 NCS]. The compounds cis-[Mn(CO) L SCN] and cis-[Mn(CO) L2SCN] contain sulfur-bonded thiocyanate. The fact that the latter has not been isolated with P(C Hg) may be due to the small size of phosphorus, relative to arsenic and antimony, " which considerably crowds the phenyls around the metal. This explanation is supported by molecular models (Stewart) of the compounds. The different modes of Mn-CNS attachment in the cis- and trans-disubstituted complexes may be due to a greater steric hindrance in the former. Molecular models... 

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