Nickel, thiocyanato

By the stepwise thermal decomposition of the tris chelate, mono adducts of the type [NiX2(N—N)] (X = halides, NCS) were obtained.852-854 These complexes are polynuclear six-coordinate with bridging anions. In the thiocyanato derivative the nickel atoms are ferromagnetically coupled. 

On the other hand, methanolysis of 277 in the presence of silver carbonate and silver perchlorate gave the corresponding glycoside 278 in 83% yield, as well as the 2-thiocyanato-D-glucal triacetate 276 in 11% yield. Desulfurization of 278 with Raney nickel afforded 3,4,6-tri-O-acetyl-2-deoxy-0-D-arabino-hexopyranoside (279) in 56% yield.37... 

The simplest and the least technically demanding method of isolating S,S-CHIRAPHOS from the reaction mixture is by the formation of its very insoluble bis(thiocyanato-N)nickel(II) complex. The nickel selectively separates the S.S-CHIRAPHOS from other phosphine species in the reaction mixture. 

It has been involved in many industrial explosions. Explodes on contact with aluminum + barium nitrate + potassium nitrate + water. Forms explosive mixtures with aluminum powder + titanium dioxide, ethylene glycol (240°C), cotton lint (245°C), furfural (270°C), lactose, metal powders (e.g., aluminum, iron, magnesium, molybdenum, nickel, tantalum, titanium), sulfur, titanium hydride. Reaction with ethanol + heat forms the explosive ethyl perchlorate. Violent reaction or ignition under the proper conditions with aluminum + aluminum fluoride, barium chromate + mngsten or titanium, boron + magnesium + silicone rubber, ferrocenium diammine-tetrakis(thiocyanato-N) chromate(l —), potassium hexacyanocobaltate(3—), A1 +... 

Raney nickel in aqueous ethanol normally acts to substitute hydrogen atoms in place of all of the alkyl-(or aryl- or other)thio groups present in a dithioacetal, without disturbing other substituents thus, the 2-S-ethyl-2-thio-D-pentose diethyl dithioacetal137 156, 5-S-ethyl-5-thio-D-arabinose diethyl dithioacetal145 (157), and 2,3,4,5-tetra-0-acetyl-6-S-acetyl-6-thio-D-galactose diethyl dithioacetal or its 6-thiocyanato analogue346 (158) react with Raney nickel to... 

POLSf-BIS(THIOC YANATO-AT)BIS-(i-(lW-l, 2,4-TRIAZOLE-AP,AT4)METAL(II) COMPLEXES WITH MANGANESE, IRON, COBALT, NICKEL, COPPER AND ZINC, AND BIS[TRIS(THIOCYANATO- V)TRIS( x-4//-l,2,4-TRIAZOLE-ATI)NICKEL(II)-A2 V2VVrlNICKEL(H)... 

Differential calorimetry has been used to measure the enthalpies of formation of the MSCN complexes (M = Mn(II), Co(Il), Ni(ll), Cu(II), Zn(ll), Cd(ll) and Pb(Il)) in aqueous solutions at 25°C. No backgroimd salt was used to attempt to maintain constant ionic strength. The concentration of nickel(ll) perchlorate varied between 5.04 and 8.9 mM, while [SCN ],ot ranged from 2.44 to 4.31 mM. Thus only the mono-thiocyanato complex was formed in the calorimeter ... 

Potentiometric measurements have been performed at 25, 35 and 45°C to determine thermodynamic parameters of the mono-thiocyanato complexes of five 3d metal ions, among them nickel(II). The activity coefficients of the different species were calculated by the Davies equation. Since the Davies equation is not compatible with the SIT, and no experimental data are provided, the reported thermodynamic functions were not considered in this review. 

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