Copper Group Metals

A few four-coordinate complexes of the formulas CuL3C104 (L = Ph3P, Ph2EtAs, Ph2-n-PrAs L3 = tox) and Cu(Ph3P)2C104 have been reported (94, 96, 97) the last one is a dimer with bridging bidentate 

Bond Lengths and Bond Angles of Copper Perchlorate Complexes 

The a isomer (deep blue, triclinic) of the dmaep complex is also dinuclear but six-coordinate. The IR spectrum of this form shows very intense peaks at 1145,1128, and 1072 cm-1, which have been assigned to bidentate perchlorate. This deduction has been confirmed by crystallographic evidence (10). The perchlorates are positioned directly above and below the planar central dimeric [(dmaep)Cu(/t-OH)2Cu-(dmaep)]2+ unit (Fig. 11), each linked to the two copper atoms via two 

Cu(en)2(C104)2 complex by Pajunen (107, 108) has shown unidentate coordination of both perchlorates in the long tetragonal positions above and below the planar [Cu(en)2]2+ unit. 

The structure of a trinuclear complex, Cu3(Im)8(Imz)2(C104)4 (130), has been described to consist of three octahedrally (distorted) coordi- 

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Perchlorate ion complexes, 28 255-299 with cobalt group metals, 28 265-268 coordination types, 28 256-260 with copper group metals, 28 273-283 with early transition metals, 28 260-263 electronic spectra. 28 258-259 ESR spectra, 28 260 infrared and Raman spectra, 28 257-258 with iron group metals, 28 263-265 with lanthanides, 28 260-265, 287-288 magnetic susceptibility, 28 260 molar conductivities, 28 260 with nickel group metals. 28 268-273 X-ray crystal structure analysis, 28 256-257... 

Although self-assembly processes of sulfur-containing compounds occur at the surfaces of many metals, especially the copper-group metals (Cu, Ag, Au), the most extensive studies have been... 

The behavior of the copper group metals toward RX is rather different from that of nickel and palladium. Organometallic products have been isolated in only a few cases so far. Silver atoms react with i-C3F7I,... 

Perchlorate Frequencies of Copper Group Metal Complexes... 

Interest in these studies arises from fundamental research where monolayers serve as models of biomimetic systems, as well as from important apphcations of such systems in molecular and bioelectronic devices, in sensors construchons, corrosion/inhibition phenomena, and synthesis of nanostructures ]93]. Although self-assembly processes of sulfur-containing compounds occur at the surfaces of many metals, especially the copper-group metals (Cu, Ag, Au), the most extensive studies have been... 

Table 4.20. a-Carbyl Complexes of Copper Group Metals... 

Figure 4.6. Structures of carbyl complexes of copper group metals (a) [CuC = CPh] , (b) Cu8(C6H40Me)8, (c) Cu2Li2(C6H4CH2NMe2-2)4/ " ) (d) [Au (SPPh2CH2)2 Au l2]/ " (e) [Ag(PPli3)2][Ag(CCPh)2] (distances are in pm units).

Some compounds of the copper group metals are as follows ... 

Electroplated Metals and Alloys. The metals electroplated on a commercial scale from specially formulated aqueous solutions iaclude cadmium, chromium, cobalt, copper, gold, iadium, iron, lead, nickel, platinum-group metals, silver, tin, and ziac. Although it is possible to electroplate some metals, such as aluminum, from nonaqueous solutions as well as some from molten salt baths, these processes appear to have achieved Httie commercial significance. 

Colour - A striking feature of transition-metal compounds is their colour. Whether it is the pale blue or pink hues of copper(ii) sulfate and cobalt(ii) chloride, or the intense purple of potassium permanganate, these colours tend to be associated most commonly with transition-metal compounds. It is rare for compounds of main group metals to be highly coloured. 

A number of investigations of the copper-group oxides and dioxygen complexes have been reported. The electronic spectra of CuO, AgO, and AuO were recorded in rare-gas matrices (9), and it was found that the three oxides could be formed effectively by cocondensation of the metal atoms with a dilute, oxygen matrix, followed by near-ultraviolet excitation. The effective wavelengths for CuO or AgO formation were X > 300 nm and for AuO was X > 200 nm. In addition, the laser fluorescence spectrum of CuO in solid Ar has been recorded (97). 

During the traditional qualitative inorganic analytical procedure, samples containing the lead and salicylate radicals can lead to the formation and possible detonation of lead picrate. This arises dining evaporation of the filtrate with nitric acid, after precipitation of the copper-tin group metals with hydrogen sulfide. Salicylic acid is converted under these conditions to picric acid, which in presence of lead gives explosive lead picrate. An alternative (MAQA) scheme is described which avoids this possibility. 

Gold occurs as an alloy with copper, nickel and platinum group metals. Typically contains low amount of gold... 

Corrosion reactions, 21 845 Corrosion resistance, 9 710 10 441 of copper wrought alloys, 7 742-744 of lead-calcium alloys, 14 774 of materials used with fluorine, 11 839 of platinum-group metals, 19 600, 601t of silver, 22 639... 

Raney nickel, copper and platinum group metal catalysts have also been used as catalysts for transforming fructose into mannitol via catalytic hydrogenation (Scheme 14) 197-199,203,204 supported on carbon... 

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