Cadmium compound

Cadmium selenide CdSe F43m fee Zinc blende Fig.4.1-13U 

CdS crystallizes in several different structures. Besides the most common wurtzite structure, it is found also in the zinc blende structure and in the high-pressure NaQ structure. Epitaxial layers of CdS are frequently found in one of the cubic modifications. 

Under ambient conditions, CdSe crystalUzes in the zinc blende structure. Ab initio calculations show that the energy of the zinc blende structure is lower than that of the wurtzite structure by 1.4 meV/atom. Under increasing pressure, the wurtzite structure transforms to the NaCl structure, the j6-tin structure, and as yet unidentified structures. If not stated otherwise, the data in this section concern CdSe in the zinc blende structure. 

Cadmium selenide CdSe a = 0.6077 (5) Perpendicular to surface, X-ray diffraction 

Crystal Structure, Mechanical and Thermal Properties Tables 4.1-150-4.1-157. 

---

The State of New Jersey has passed a law restricting the sale and disposal of batteries (qv) containing mercury, requiring manufacturers to reduce the mercury content of each battery to 1 ppm by weight by 1995, and to estabhsh a collection program for spent batteries (14). Another New Jersey law bans the sale of products having cadmium, mercury, or other toxic materials in the packaging (14) (see Cadmiumand cadmium alloys Cadmium compounds Mercury compounds). 

Almost all the methods described for the nickel electrode have been used to fabricate cadmium electrodes. However, because cadmium, cadmium oxide [1306-19-0], CdO, and cadmium hydroxide [21041-95-2], Cd(OH)2, are more electrically conductive than the nickel hydroxides, it is possible to make simple pressed cadmium electrodes using less substrate (see Cadmium and cadmium alloys Cadmium compounds). These are commonly used in button cells. 

X 10 mol/L in 8 Mpotassium hydroxide at room temperature. In general it is believ ed tliat tlie solution process consists of anodic dissolution of cadmium ions in tlie form of complex hydroxides (see Cadmium compounds). 

Naturally occurring cadmium compounds are limited to the rare minerals, greenockite [1317-58 ] CdS, and otavite (1), an oxycarbonate, but neither is an economically important source of cadmium metal or its compounds. Instead, cadmium compounds are more usually derived from metallic cadmium [7440-43-9] which is produced as a by-product of lead—2inc smelting or electrolysis (see Cadmiumand cadmium alloys). Typically, this cadmium metal is burnt as a vapor, to produce the brown-black cadmium oxide [1306-19-0], CdO, which then acts as a convenient starting material for most of the economically important compounds. 

Table 1. Physical and Chemical Properties of Selected Cadmium Compounds ...

Because of the high processing temperatures there are few pigments suitable for use with PTFE. A number of inorganic pigments, particularly the cadmium compounds, iron oxides and ultramarines, may, however, be used. 

Your company receives toluene, a listed toxic chemical, from another facility, reacts the toluene with air to form benzoic acid, and further reacts the benzoic acid with a cadmium catalyst to form terephthallc acid. Cadmium compounds and terephthallc acid are also listed toxic chemicals. Your company processes toluene, and otherwise uses (not processes) the cadmium catalyst (see the definition of "otherwise use" below). Your company manufactures benzoic acid and terephthallc acid. Benzoic acid, however, is not a listed chemical and thus does not trigger reporting requirements. 

Cadmium Compounds - Includes any unique chemical substance that contains cadmium as part of that chemical s infrastructure. 

The functionalized cadmium compound dialkoxyphosphinyldifluorometh-ylcadmium is readily prepared by direct reaction of bromodifluoromethanephos-phonates with cadmium metal [13 ] (equation 105). This cadmium reagent shows versatile chemical reactivity and reacts with a wide variety of electrophiles, as illustrated m equations 106-109 [139,140,141, 142]... 

Only a few reports of unsacurated fluormated cadmium compounds have appeared The direct reaction of perfluoroalkenyl lod ides or bromides with cadmium powder in DMF stereospecifically gives the vinylcadmium compounds [143] (equation 110) Table 5 shows several typical vinylcadmiums prepared by this method. 

The perfluoroalkylacetylenic cadmium compounds can be prepared via the reaction of the 1-iodoperfluoroalkylacetylene with cadmium powder [147] (equation 114)... 

Table 7. Preparation of Fluorinated Vinylcopper Reagents via Exchange of Cu(I) Halides with Fluorine-Containing Vinybinc or Cadmium Compounds [145]...

Tfifluorovinyl- and ( 0-pentafluaropropenylsilver compounds can be prepared via the exchange reaction of the corresponding cadmium compound with silver trifluoroacetate [144] (equation 189) The 2-pentafluoropropenyl silver compound can be synthesized via a similar exchange reaction of silver tnfluo-roacetate with 2-pentafluoropropenyllithium [279]... 

T.3.2.3. Preparative Methods 7.3.2.3.2. of Alkali-Metal-Cadmium Compounds. 

---