Dihydroxo

The hydroxo complexes [Au(6-Rbipy)(OH)2], postulated as intermediates in the formation of 44c-i, are not isolated nevertheless, in all the mass spectra (FAB conditions) a weak peak is found corresponding to these species. Unchanged 44c-i are quantitatively recovered from the reaction with aqueous solutions of HX (X = BF4 or PFfi) neither dihydroxo complexes similar to those observed in the vapor phase, nor hydroxo bridged dimers are obtained [25]. 

The sulfate ion, well known as a monodentate and simple bidentate ligand, has been observed also as a bridging ligand, as exemplified in [(en)2Co(OS(O2)O)2Co(en)2]2+.10°3 The c/.v-bisf/x-sulfato) bridge undergoes hydrolysis to c -[Co(en)2(OS03)(OH2)]+ in acidic solution, hydrolyzing further with loss of coordinated sulfate in aqueous base to the dihydroxo complex. 

Platinum(IV) complexes have been known to be anticancer active since the original studies in this area by Rosenberg.447 Consequently numerous platinum(IV) complexes have been prepared for biological testing. Until recently, the great bulk of these were trans-dihydroxo complexes prepared... 

ApoSOD, 45 186, 190 Apo VFe protein, 47 204 APS reductase, see Adenylylsulfate reductase Aqua-bridged hydroxo complexes acid-base equilibria, 32 110 of dihydroxo-bridged species, 32 114-115... 

Dihydrogen complexes, osmium, 37 3(X)-301 Dihydroxo-bridged complexes acid-base equilibria, 32 108-110 quantitative considerations, 32 115-118 binuclear, 32 66-67 crystallographic data, 32 61, 63 stability complexes, 32 103-104... 

A series of tetraquo-dcrivatives containing two molecules of pyridine is also known. These have formula [Cr py2(H20)4]R3, and correspond in general properties to the diammino series. They are prepared from green hydrated chromic chloride, [CrCl2(H20)4]C1.2lI20, by treatment with pyridine, when it is transformed into the dihydroxo-diaquo-dipyri-dino-chloride, [Cr pya(H20)2(0H)2]Cl, and this on treatment with mineral acid changes into the tetraquo-salt.6... 

Tetraquo -dipyridino -chromic Chloride, [Cr py2(H20)4]Cl3. 2H2Q,8 formed by acting upon dihydroxo-diaquo-dipyridino-chromie... 

Salts such as hydroxo - triaquo - diammino - chromic sulphate, Cr(NH3)2(I-I20)s.OH]S04.H20, and the corresponding dipyridino-salt, Cr py 2(H20)3(0H)]S04, have been prepared, the former from dihydroxo-diaquo-diammino-chromie bromide by treatment with sulphuric acid,3... 

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