Group arsenides

The first alkali metal-niobium-arsenic compounds were synthesized by accident while attempting the synthesis of alkali-metal main-group arsenides at relatively high temperature. It turns out that niobium and tantalum containers react readily... 

Loellingite is an orthorhombic (Pnnm space group) arsenide mineral. Each iron atom in loellingite is coordinated with six arsenic atoms. The arsenic atoms have fourfold coordination, where every arsenic atom is bonded to another arsenic atom and three iron atoms. That is, the arsenic-arsenic bonds in loellingite produce AS22- units (Nesbitt, Uhlig and Szargan, 2002), 1000. 

Two of the materials systems shown ia Figure 6 are of particular importance. These are the ternary compounds formed from the Group 13 (III) elements such as A1 and Ga ia combination with As (6) and quaternary compounds formed from Ga and In ia combination with As and P (16—18). The former, aluminum gallium arsenide, Al Ga As, grown on GaAs, is the best known of the general class of compounds The latter, gallium... 

Another good method for preparing secondary arsines involves cleavage of an alkyl or aryl group from a tertiary arsine and subsequent hydrolysis of the resulting secondary arsenide (47,48) ... 

The ground-state electronic structure of As, as with all Group 15 elements features 3 unpaired electrons ns np there is a substantial electron affinity for the acquisition of 1 electron but further additions must be effected against considerable coulombic repulsion, and the formation of As is highly endothermic. Consistent with this there are no ionic compounds containing the arsenide ion and... 

A further interesting feature of the gallium phosphides and arsenides is that the former compounds are colorless whereas the latter range from yellow to orange. Color can arise from ir- ir transitions in main group compounds for example, in the disilylenes and digermenes R2E = ER2 (E = Si, Ge) in which the it- tt transitions occur at lower energy than... 

Bis(trimethylsilyl)arsine reacts with diethyl- or dimethylzinc to form different arsenide complexes with the structure dependent on the steric demands of the alkyl group. In the presence of both methyl and ethyl groups alkylzinc bis(trimethylsilylarsenide) forms which has a trimeric solid state structure (37) with a six-membered Zn3As3 and Zn-As distances with an average of 2.48 A.322... 

As the solid state structures of heterocyclic group 13 amides, phosphides and arsenides have been reviewed in the past,76 they will not be discussed here. Instead, the solid state structures of group 13 stibides and bismuthides will be described in detail. 

The alkoxide group R is chosen so that the heavier alkali metal alkoxide MOR is soluble in ether or hydrocarbon solvents and so the by-product LiOR may easily be separated from the desired heavier alkali metal phosphide/arsenide (which is often insoluble in weakly or noncoordinating solvents such as ethers and hydrocarbons). 

To date only one polyanionic arsenide complex of an alkali metal has been reported. The complex [B GejAslSiPrilLijsh is obtained from the reaction of Bu GeF3 with 3 equiv of Li AsH(SiPii) and BuLi in ether in 24% yield (107). The complex contains a Ge2As6Li6 framework with a center of symmetry in a distorted rhombododecahedral arrangement (Fig. 13). Each As atom is thus bound to three Li atoms in addition to one Ge atom and one exocyclic SiPr( group the Li atoms are in contact with three As atoms and also with two H atoms from different SiPr], groups [Li-As = 2.52(2) to 2.62(2) A], Additional solvation of the Li atoms is not observed, even though the complex is syn-... 

No, the editor didn t know what this name meant either.) It means salts of the triva-lent anions of Group V, restricted in [1] to arsenides, antimonides and bismuthides and prepared by reaction of sodium pnictides with anhydrous halides of transition and lanthanide metals. This violently exothermic reaction may initiate as low as 25°C. Avoidance of hydrated halides is cautioned since these are likely to react uncontrollably on mixing. Another paper includes a similar reaction of phosphides, initiated by grinding [2], Nitrides are reported made from the thermally initiated reaction of sodium azide with metal halides, a very large sealed ampoule is counselled to contain the nitrogen [3],... 

---