Arsenidostanates are chemical compounds that contain anions with arsenic bonded to tin. They are in the category of tetrelarsenides, pnictidostancates, or tetrelpnictides.
They are distinct from arsenide stannides such as palarstanide, (Pd8(Sn,As)3) where the cation charge exceeds that on the tin or arsenic. [1] Other minerals that contain arsenic and tin are erniggliite [2] and coiraite. [3]
| name | formula | formula weight | crystal system | space group | unit cell | volume | density | comments | ref |
|---|---|---|---|---|---|---|---|---|---|
| Li1–xSn2+xAs2, 0.2 < x < 0.4 | trigonal | R3m | a=3.991-4.0244 c=25.592-25.632 Z=3 | 353.6-358.9 | [4] | ||||
| Na2SnAs2 | I41/acd | a=14.166, c=21.191, Z = 32 | metallic grey | [5] | |||||
| NaSn2As2 | rhombohedral | R3m | a=4.000 c=27.562 | metallic; layers | [6] | ||||
| KSn3As3 | orthorhombic | Pnma | Z=4 | band gap 0.50 eV | [7] | ||||
| RbSn3As3 | orthorhombic | Pnma | a=10.321, b=4.0917, c=19.570 | [7] | |||||
| Ca5Sn2As6 | orthorhombic | Pbam | a = 13.643, b = 11.830, c = 4.121 Z=2 | [8] | |||||
| α-Sr3Sn2As4 | orthorhombic | Cmca | a = 25.798, b = 12.888, c = 19.124, Z = 24 | 6358.8 | melt 1185K; band gap 0.9 eV | [9] | |||
| β-Sr3Sn2As4 | monoclinic | P21/c | a = 7.705, b = 19.118, c = 7.688, β = 112.003°, Z = 4 | 1049.9 | dec>800K; band gap 0.9 eV | [9] | |||
| Sr14Sn3As12 | trigonal | R3 | Z=3 | [10] | |||||
| Ba3Sn4As6 | monoclinic | P21/n | a=8.637, b=18.354, c=9.721, β=90.05°, Z=4 | [11] | |||||
| BaCu6Sn2As4−x | tetragonal | I4/mmm | a = 4.164, c = 24.088 | [12] | |||||
| Ba13Si6Sn8As22 | 4551.72 | tetragonal | I42m | a = 14.4857, c = 13.5506 Z=2 | 2843.4 | 5.316 | black; Si4As10 units; band gap 1.0 eV | [13] | |
| EuSn2As2 | trigonal | [14] | |||||||
| Eu14Sn3As12 | trigonal | R3 | Z=3 | [10] | |||||
| Eu11Zn4Sn2As12 | 3069.46 | monoclinic | C2/c | a = 7.5679, b = 13.0883, c = 31.305, β = 94.8444 Z=4 | 3089.7 | 6.599 | silver; band gap 0.04 eV; ferromagnetic below 15K; negative colossal magnetoresistance | [15] |
In chemistry, an arsenide is a compound of arsenic with a less electronegative element or elements. Many metals form binary compounds containing arsenic, and these are called arsenides. They exist with many stoichiometries, and in this respect arsenides are similar to phosphides.
The phosphidosilicates or phosphosilicides are inorganic compounds containing silicon bonded to phosphorus and one or more other kinds of elements. In the phosphosilicates each silicon atom is surrounded by four phosphorus atoms in a tetrahedron. The triphosphosilicates have a SiP3 unit, that can be a planar triangle like carbonate CO3. The phosphorus atoms can be shared to form different patterns e.g. [Si2P6]10− which forms pairs, and [Si3P7]3− which contains two-dimensional double layer sheets. [SiP4]8− with isolated tetrahedra, and [SiP2]2− with a three dimensional network with shared tetrahedron corners. SiP clusters can be joined, not only by sharing a P atom, but also by way of a P-P bond. This does not happen with nitridosilicates or plain silicates.
The borate fluorides or fluoroborates are compounds containing borate or complex borate ions along with fluoride ions that form salts with cations such as metals. They are in the broader category of mixed anion compounds. They are not to be confused with tetrafluoroborates (BF4) or the fluorooxoborates which have fluorine bonded to boron.
Oxyarsenides or arsenide oxides are chemical compounds formally containing the group AsO, with one arsenic and one oxygen atom. The arsenic and oxygen are not bound together as in arsenates or arsenites, instead they make a separate presence bound to the cations (metals), and could be considered as a mixed arsenide-oxide compound. So a compound with OmAsn requires cations to balance a negative charge of 2m+3n. The cations will have charges of +2 or +3. The trications are often rare earth elements or actinides. They are in the category of oxypnictide compounds.
Borate sulfides are chemical mixed anion compounds that contain any kind of borate and sulfide ions. They are distinct from thioborates in which sulfur atoms replace oxygen in borates. There are also analogous borate selenides, with selenium ions instead of sulfur.
Selenide borates, officially known as borate selenides, are chemical mixed anion compounds that contain any kind of borate and selenide ions. They are distinct from selenoborates in which selenium atoms replace oxygen in borates. There are also analogous borate sulfides, with sulfur ions instead of selenium.
Selenogallates are chemical compounds which contain anionic units of selenium connected to gallium. They can be considered as gallates where selenium substitutes for oxygen. Similar compounds include the thiogallates and selenostannates. They are in the category of chalcogenotrielates or more broadly chalcogenometallates.
Sulfidostannates, or thiostannates are chemical compounds containing anions composed of tin linked with sulfur. They can be considered as stannates with sulfur substituting for oxygen. Related compounds include the thiosilicates, and thiogermanates, and by varying the chalcogen: selenostannates, and tellurostannates. Oxothiostannates have oxygen in addition to sulfur. Thiostannates can be classed as chalcogenidometalates, thiometallates, chalcogenidotetrelates, thiotetrelates, and chalcogenidostannates. Tin is almost always in the +4 oxidation state in thiostannates, although a couple of mixed sulfides in the +2 state are known,
A chloride nitride is a mixed anion compound containing both chloride (Cl−) and nitride ions (N3−). Another name is metallochloronitrides. They are a subclass of halide nitrides or pnictide halides.
A Phosphide chloride is a mixed anion compound containing both phosphide (P3−) and chloride (Cl−) ions.
Arsenidosilicates are chemical compounds that contain anions with arsenic bonded to silicon. They are in the category of tetrelarsenides, pnictidosilicates, or tetrelpnictides. They can be classed as Zintl phases or intermetallics. They are analogous to the nitridosilicates, phosphidosilicates, arsenidogermanates, and arsenidostannates. They are distinct from arsenate silicates which have oxygen connected with arsenic and silicon, or arsenatosilicates with arsenate groups sharing oxygen with silicate.
Arsenidogermanates are chemical compounds that contain anions with arsenic bonded to germanium. They are in the category of tetrelarsenides, pnictidogermanates, or tetrelpnictides.
Selenidogermanates are compounds with anions with selenium bound to germanium. They are analogous with germanates, thiogermanates, and telluridogermanates.
Sulfidogermanates or thiogermanates are chemical compounds containing anions with sulfur atoms bound to germanium. They are in the class of chalcogenidotetrelates. Related compounds include thiosilicates, thiostannates, selenidogermanates, telluridogermanates and selenidostannates.
Arsenide iodides or iodide arsenides are compounds containing anions composed of iodide (I−) and arsenide (As3−). They can be considered as mixed anion compounds. They are in the category of pnictidehalides. Related compounds include the arsenide chlorides, arsenide bromides, phosphide iodides, and antimonide iodides.
Selenidostannates are chemical compounds which contain anionic units of selenium connected to tin. They can be considered as stannates where selenium substitutes for oxygen. Similar compounds include the selenogermanates and thiostannates. They are in the category of chalcogenidotetrelates or more broadly chalcogenometallates.
Tellurogermanates or telluridogermanates are compounds with anions with tellurium bound to germanium. They are analogous with germanates, thiogermanates and selenidogermanates.
Phosphidogermanates are chemical compounds that have phosphorus bound to germanium to yield anions. They are in the category of phosphidotetrelates and also pnictides. They are analogous to nitridogermanates, phosphidoaluminates, phosphidogallates, phosphidoindates, phosphidosilicates or phosphidostannates.
A selenophosphate is a chemical compound containing phosphate anions substituted with selenium. Over 7000 compounds are known with a bond between selenium and phosphorus. Compared to phosphorus-sulfur compounds selenophosphates are less thermally stable, and more easily destroyed by water. However they are more stable than tellurophosphates which have an even weaker phosphorus-tellurium bond. Selenophosphates have an oxidation number for phosphorus of +5. But in many there are bonds between phosphorus atoms, reducing the oxidation state to +4, Some may be termed selenophosphites.
Thallides are compounds containing anions composed of thallium. There are several thallium atoms in a cluster, and it does not occur as a single Tl− in thallides. They are a subclass of trielides, which also includes gallides and indides. A more general classification is polar intermetallics, as clusters contain delocalized multicentre bonds. Thallides were discovered by Eduard Zintl in 1932.