Platinum trans-, nitrate

ClHgNjOgPt, Platinum(II), diamineaqua-chloro-, trans-, nitrate, 22 125 CIIrOPCi7H22, Iridium(I), carbonylchlorobis-(dimethylphenylphosphine)-, trans-, 21 97... 

PtClH N304, Platinum(Il), dianunineaqua-chlmo-, trans-, nitrate, 22 125 PtClo3i S2N4C4, Platinate, tetracyano-, cesium chloride (1 2 0.30), 21 142 PtClo.3oN4Rb]C4 3H2O, Platinate, tetracyano-, rubidium chloride (1 2 0.30), trihydiate, 21 145... 

The chlorine atoms in these compounds are unusually labile, especially in the case of the cis isomer, which in aqueous and alcoholic solution yields an immediate precipitate with silver nitrate, while the trans isomer reacts more slowly. This lability also causes interconversion to occur readily, as during recrystallization from water or often in metatheses. The two isomers can readily be distinguished by treatment with silver(I) oxide.2 The cis compound reacts immediately to give the soluble strong base [Pt (C2-H5)2S 2(OH)2], while the trans compound slowly decomposes to black platinum(II) oxide and diethyl sulfide, the solution remaining neutral. 

These compounds are convenient starting materials for the preparation of a wide variety of platinum(II) complexes. The chlorine atoms can be replaced by other negative groups such as bromide, iodide, hydroxide, nitrate, nitrite, and thiocyanate. The ammonia molecules can be replaced by other bases such as pyridine, arylamines, and quinoline. Oxidation with aqua regia or chlorine yields the corresponding isomers of tetrachlorodiammineplatinum(IV) (synthesis 62). A supposedly third (7-) form has been shown to be a solid solution or mixture of the cis (jS-) and trans (a-) isomers. 

The dipole moments in benzene solution are 11.5 D. and 0 D., respectively. Such measurements were used by Jensen to prove unequivocally that the configuration of tetra-coordinate bivalent platinum is square planar. Conductivity measurements of their benzene solutions have shown them to be nonelectrolytes, but conductivity in alcoholic solutions increases with time because of alcoholysis. The conductivity of the cis isomer increases more rapidly than that of the trans. Aqueous and alcoholic solutions of the cis isomer give an immediate precipitate with silver nitrate, whereas those of the trans isomer react more slowly. 

CS5H67B2CU2N9O2 f (M Histamine)-bis[histamine(carbonyl)copper(I)] bis(tetraphenylborate), 46B, 1138 Cs6HssN6P2Pt, cis-Bis(1,3-diphenyltriazenido)bis(triphenylphos-phine)platinum(II) benzene solvate, 42B, 874, 998 CssHt2C1 NisNi204, M Chloro-bis(chlorotetra(benzimidazole)nickel-(II)) chloride-4-acetone, 33B, 435 C72H5sCl1sCoNioOi0 f trans-Tetrakis(miconazole)cobalt(II) nitrate, 44B, 958... 

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