Cadmium complexes nitrate

Zinc and cadmium complexes of the novel tripod ligand (145) have also been described.1087 The reaction of Hg(HL)2 (HL = 2-mercaptobenzoic acid, 146) with cadmium nitrate leads to the novel CdHgL species, in which the cadmium is bonded to the carboxylate oxygen atom, and the mercury to the thiolate sulfur.1088... 

N3CI plane (207). The other halids and the cadmium complexes are isomor-phous with the appropriate forms, and undoubtedly possess related five-coordinate structures. A number of studies of the vibrational spectra of the [M(terpy)X2] species have been described, all of which support the formulation as isomorphous five-coordinate complexes (124, 171, 225, 371). The copper(II) complexes [Cu(terpy)Cl2] are isostructural, and a number of studies of the paramagnetic species doped into a host matrix of [Zn(terpy)Cl2] have been reported (23, 213). The zinc complex [Zn(terpy)Cl2] exhibits absorption maxima at 22,650 and 18,000 cm (23, 348). The mercury(II) halide adducts are not so well characterized, but may be prepared by the direct reaction or HgX2 with terpy (171) or by trans-metallation of [Ph2Sn(terpy)Cl2] with HgCl2 (471). They are thought to possess similar, five-coordinate structures. The structures of the 1 1 adducts of the nitrates M(N03)2 terpy are not known with any certainty (171,328). A Cd NMR study of Cd(N03)2 terpy has been reported (430). 

Cadmium sulfide films were deposited on substrates in basic cadmium nitrate solutions with cadmium complexed by excess ammonia. Slow decomposition of thiourea was used to generate the sulfide ion. Some initial studies of film growth on derivatized polyethylene suggested a dependence of film density surface on... 

Prepare a solution of 2.72 g cadmium bromide and dissolve in this solution 2.38 g KBr and heat to dissolve the solids. Prepare a solution 2.42 g copper(lI) nitrate trihydrate to which 1.2 g diaminoethane has been added and heat the solution. Add the hot solution slowly and, with constant stirring, to the hot cadmium complex solution. Allow to cool and filter the dark violet crystals under suction. Wash on the filter with water to remove any unreacted compounds then with small volumes of alcohol and ether. Dry by continued suction while pressing between filter paper. 

Cadmium Hydroxide. Cd(OH)2 [21041-95-2] is best prepared by addition of cadmium nitrate solution to a boiling solution of sodium or potassium hydroxide. The crystals adopt the layered stmcture of Cdl2 there is contact between hydroxide ions of adjacent layers. Cd(OH)2 can be dehydrated to the oxide by gende heating to 200°C it absorbs CO2 from the air forming the basic carbonate. It is soluble ia dilute acids and solutions of ammonium ions, ferric chloride, alkah haUdes, cyanides, and thiocyanates forming complex ions. 

The perfluoroalkylsilver complexes exist in a dynamic equilibrium in solution with solvated silver ion and anionic perfluoroalkylsilver complexes such as Ag[CF(CF5) r [277] The triflnoromethylated silver complex, Ag(CF3)4 , is prepared via reaction of bis(trifIuoromethyl)cadmium with silver nitrate in acetoni trile [278]... 

The coordination modes of the nitrate ligand in the complexes [TpBut]M(N03) (M = Cu, Ni, Co, Zn) are summarized in Fig. 46. (171, 184). Evidently, the coordination mode varies from unidentate for Zn to symmetric bidentate for Ni and Cu, with the cobalt derivative exhibiting an anisobidentate coordination mode. Moreover, the related cadmium derivative [TpBut,Me]Cd(N03) also exhibits bidentate coordination of the nitrate ligand, with Cd-0 bond lengths of2.272(6) A and 2.295(7) A (91). Such symmetric bidentate coordination contrasts with the significantly different Zn-0 interactions [1.978(3) A and 2.581(3) A] in unidentate [TpBut]Zn(N03). The coordination modes for a variety of [TpRR ]M(N03) complexes are summarized in Table VIII. 

Organic complexed Cd is not important in arid soil solution. Hirsh and Banin (1990) observed 5-10% of Cd bound to organic ligands in Israeli arid soil solution. Emmerich et al. (1982) found that organic-Cd complexes constituted 1-4% of Cd in California arid soil solution. However, Villarroel et al. (1993) reported that in a California sludge-treated soil, Cd was mainly present in both free ion and organic complex forms (each accounted for 32-40% and 30-45% of total Cd in soil solution, respectively), followed by the chloride complexes (8-20%), S04-complex (3-10%), and P04-Cd complex (1.5-7.7%). The nitrate Cd complexes were the lowest. Cadmium activities and speciation is not significantly affected by P and N treatments. 

The Department of the Environment UK [155] has described a number of alternative methods for the determination of total oxidised nitrogen (nitrate and nitrite) in aqueous solution, while specific methods for nitrate and nitrite are also included. Among the methods for total oxidised nitrogen, one is based on the use of Devarda s alloy for reduction of nitrate to ammonia, and another uses copperised cadmium wire for reducing nitrate to nitrite, which is determined spectrophotometrically. Nitrate may also be determined spectrophotometrically after complex formation with sulfosalicylic acid or following reduction to ammonia, the ammonia is eliminated by distillation and determined titrimetrically. Other methods include direct nitrate determination by ultraviolet spectrophotometry, measurements being made at 210 nm, and the use of a nitrate-selective electrode. Details of the scope, limits of detection, and preferred applications of the methods are given in each case. 

Cadmium nitrate, preparation of, 6 135 Cadmium phthalocyanine electronic absorption spectra of, 7 68 preparation of, 7 41 Cadmium selenocyanates, 17 337 Cadmium sulfoxide complexes, 24 167-168... 

This can certainly be extended to other metal sulphides, using other complexes of sulphur (and also selenium). However, the complex and anion of the metal salt need to be chosen so that all the by-products of the pyrolysis reaction are volatile, otherwise the film will be contaminated with the nonvolatile by-products. For example, using cadmium nitrate and thiourea, all the by-products are volatile ... 

Cadmium nitrate forms complex salts with ammonia, such as hexammino-cadmium nitrate, [Cd(NH3)6](N03), and the hydrate. [Cd(NH3)6](N03).H20.1 These are crystalline substances, easily decomposed by water. The hydrated salt loses water on heating, becomes dark in colour, and finally decomposes with explosion. 

Similar results axe found in mCd (16.31 MHz at 1.807 T) NMR studies 29 large non-linear chemical shifts with concentration of cadmium chloride solutions were observed, while the nitrate, sulfate and perchlorate show much smaller linear shifts, consistent with the formation of stable chlorocadmium complexes even at low concentration. 

Zinc and cadmium nitrato complexes of the 2,6-diacetylpyridine derivatives (37) have been prepared, and reveal a variety of nitrate bonding modes.351... 

The reactions of zinc and cadmium with thiomorpholin-3-one (L) and thiazolidine-2-thione (L1) result in the complexes ML4(N03)2, ML2SCL, ML4(N03)2, Znl4s04 and CdL4S04 except in the last case, IR evidence indicates coordinated sulfate, while nitrate is ionic in all cases. L is coordinated via oxygen and L1 via nitrogen.716... 

---