Diammines

Naming a Coordination Compound. To name a coordination compound, the names of the ligands are attached directly in front of the name of the central atom. The ligands are listed in alphabetical order regardless of the number of each and with the name of a ligand treated as a unit. Thus diammine is listed under a and dimethylamine under d. The oxidation number of the central atom is stated last by either the oxidation number or charge number. 

In Leclanchn cells, the high concentration of ammonium chloride leads to the formation of insoluble diammine 2inc chloride through the reaction in the electrolyte. 

Palladium and Palladium Alloys. Palladium is used in telephone equipment and in electronics appHcations as a substitute for gold in specific areas. Palladium is plated from ammoniacal and acid baths available along with chelated variations as proprietary processes. One typical alkaline bath uses 8 g/L diammine-dinitropalladium, 100 g/L ammonium nitrate, and 10 g/L sodium nitrite. The pH is adjusted to 9—10 using ammonium hydroxide, and the bath is operated at 100 A/m at 50° C. If ammonium sulfamate, 100 g/L, is used in some baths to replace the nitrate and sodium nitrite salts, the bath is mn at lower temperature, 25—35°C, and a pH of 7.5—8.5. A palladium—nickel alloy, 75% Pd, is plated from a bath having 6 g/L palladium from the same salt, 3 g/L nickel from nickel sulfamate concentrate, and 90 g/L ammonium hydroxide. The bath is operated at 20—40°C with 50-100 A/m/... 

The diammine [Hg(NH3)2Cl2], descriptively known as fusible white precipitate , can be isolated by maintaining a high concentration of NH4+, since reactions (2) and (3) are thereby inhibited, or better still by using non-polar solvents. It is made up of a cubic lattice of Cl ions with linear H3N-Hg-NH3 groups inserted so as to give the common, distorted octahedral coordination about Hg (Hg N = 203 pm, Hg-Cl = 287 pm) (Fig. 29.4a). 

Guanine derivatives, the effects of N(7)-coordinated ci.s-diammine-platinum(II) on the acid-base properties of 98PAC845. 

Carboplatin (96) is significantly less toxic in the clinic than cisplatin. Most particularly, it is much less nephrotoxic. Use of a bidentate ligand also ensures formation of a ds complex. Its synthesis begins with cis-diammine platinum diiodide (94) which is reacted with silver sulfate to give cis-diaquodiam mine platinum sulfate (95). This is reacted with the barium salt of 1,1-cyclo-butanedicarboxylic acid to yield carboplatin [23],... 

Nylon resins are important engineering thermoplastics. Nylons are produced by a condensation reaction of amino acids, a diacid and a diammine, or by ring opening lactams such as caprolactam. The polymers, however, are more important for producing synthetic fibers (discussed later in this chapter). 

The "classical" Leclanche cell uses zinc sheet formed into a cylindrical can serving simultaneously as the anode and as the cell container (AB1C1). The cathode is a mixture of Mn02 and graphite wrapped into a piece of separator and contacted by a central carbon rod. The can dissolves slowly when the cell is not in use and faster when the cell delivers electrical energy. The reaction following the primary electrochemical zinc dissolution [Eq. (19)] leads, in the case of an ammonium chloride electrolyte, to a zinc diammine cation ... 

Entry into the m-diammine system (Figure 2.50) uses the chelating ligand oxalate, as with the ammines use of NaBH4 as catalyst speeds this up. 

Figure 3.116 Platinum compounds studied for possible anti-tumour activity. I, ris-Dichlorodi-ammineplatinum(II) cisplatin, platinol NSC 119875 neoplatin platinex. II, a.s-Diammine(l,l-cyclobutanedicarboxylato)platinum(II) JM-8 paraplatin NSC 241240. Ill, Oxiplatin. IV, Tetraplatin. V, Amminediacetatodichloro(cyclohexylamine)platinum(IV). VI, cis-Dich oro-trans-dihydroxy-cis-bis(isopropylamine)platinum(IV) iproplatin JM-19 CHIP NSC 256927.

Palladium, (diammine)bis(thiocyanato)-isomerism, 1, 185 Palladium, dichlorobis(amine)-substitution reactions stereochemistry, 1, 318 Palladium, dichlorobis(pyridine)-substitution reactions, 1, 314 Palladium, dinitritobis(triisopropylphosphine)-substitution reactions, I, 314 Palladium, ethylene-synthesis... 

Ober die Protonolyse saureempfindlicher, substituierter Alken-(l)-yl-borane mit Sil-ber-diammin-nitrat s.S. 60. 

C20H28N 10O16P2Pt2- 0.88 hydrate Sodium diammine-platinum-(inosine 5 -phosphate)-inosine SINPPT 34 375... 

C10HuN4OsPs, 2.88 Na+16 HjO 0.86 C20H28N10O16P2Pt2-0.28 5 -phosphate, hexadecahydrate Sodium diammine-bis(inosine 5 -phosphate)-platinum(n)- IMPPTS 43 308... 

When experiments with electrospray producing H3N(CH2)pNH2+ ions were performed in this laboratory,56 it was found that doubly protonated ions could be obtained from methanol-water solutions only when p > 4. For p < 4 only the singly protonated ions were observed, even though the doubly protonated ions are known to be present in the solution. We attribute the failure to observe the doubly protonated ions with p < 4 to the occurrence of charge reduction by deprotonation. Probably methanol, whose gas-phase basicity is greater than that of water, is involved in the deprotonation. The diprotonated diammines, p > 4, could all be dehydrated down to the naked ion either in CID experiments or at higher temperature. 

The quaternary methylated diammines (CH3)3N(CH2)pN(CH3)3+ could be obtained from a methanol-water solution also for lower p values, i.e. p > 2. The greater stability of these doubly charged ions can be attributed to the more dispersed charge and to the absence of protic hydrogens. 

The diammine complex of diborane (formulated as above), though less reactive than diborane, ignites on heating in air [1,2],... 

N., Hagenbuch, B., Meier, P. J., Koepsell, H., Marin, J. J., Carriers involved in targeting the cytostatic bile add-dsplatin derivatives ds-diammine-chloro-cholylglycinate-platinum(II) and ds-diammine-bisursodeoxycholate-platinum(] I) toward liver cells, Mol. Pharmacol. 2002, 61, 853-860. 

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