Nitric acid ligands

Well, we were naturally interested in those negative ions which are the most abundant ones in some parts of the stratosphere, as well as the NO 3 with two nitric acid ligands. I may mention just very briefly why we were interested in that. One may not necessarily expect SO2 to cluster with these larger ions, but we have observed an increase of an ion which may be interpretative in terms of SO2 clustering to nitric acid clusters in the stratospheric eruption cloud of the volcanos. If this ion does not contain SO2 the missing ligand must be nitric acid, which has a mass number which is just one a.m.w. from the SO2. The measurements would probably indicate that there was a marked enhancement of nitric acid vapor concentration in the eruption cloud and that could be of interest. 

The NO ligand can be supplied by nitric oxide itself, but there are many other sources such as nitrite, nitrate or nitric acid, nitrosonium salts or N-methyl-7V-nitrosotoluene-p-sulphonamide (MNTS). The introduction of a nitrosyl group into a ruthenium complex is an ever-present possibility. 

Complexes are similarly formed by polydentate phosphine and arsine ligands synthetic routes involve oxidation of the platinum(II) complex, either with the halogen or with nitric acid ... 

Ligand Exchange Reactions, of Protonated Water Clusters with Nitric Acid... 

Oxidation of [Fe(phen)3] + by concentrated nitric acid is autocatalytic. " T e hen)3] + reacts with bromate by rate-determining oxidation at high bromate concentration, [Fe(bipy)3] + and ligand-substituted [Fe(phen)3] + cations react with perbromate by rate-limiting dissocia-587 Reactions of [Fe(diimine)3] + with peroxodiphosphate also involve rate-limiting dissocia-... 

The persulfate salt is only sparingly soluble in water but dissolves in nitric acid without reduction. However, dissociation or partial dissociation of the ligands occurs on dissolution. Consequently all results collected in this medium should be treated with suspidon. This includes electronic and electron spin resonance spectra.496... 

The sulfato and nitrato triphenylphosphine complexes were also obtained by the reaction of sulfuric or nitric acid with [Pd(PPh3)4] in ethanol.132 Nitrato complexes can also be prepared by isolation of [Pd(N03)2(H20)2], obtained by dissolution of Pd metal in concentrated nitric acid,133,134 and subsequent reaction with ligands L (e.g. L2 = 2,2 -bipyridyl).135 A crystal structure determination has been carried out for the complex cis-[Pd(N03)2(DM50)2].136... 

Treatment of K[Pt(0,O-MeCOCHCOMe)(C-MeCOCHCOMe)X] with mineral acids affords a material, formulated as Pt(0, -MeCOCHCOMe)Cl(MeCOCH2COMe) in which neutral, enolic acetylacetone is rc-bonded to platinum via the C=C bond. On standing, solutions of this material in chloroform yield red [Pt( -Cl)(MeCOCHCOMe)] . Similar acidification of K[Pt(MeCOCHC-OMe)3] with HX (X = Cl, Br) yields Pt(l,3,5,7-tetramethyl-2,6,9-oxabicyclo[3.3.1]nona-3,7-diene)2X2,248 whereas sulfuric, phosphoric or nitric acid leads to polymeric [Pt(MeCOCHCOMe)2]. This compound, which is isomeric with the familiar Pt(0,O-MeC0CHCOMe)2, may aggregate by means of tridentate C,0,0-MeCOCHCOMe bridging ligands.244... 

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