| 摘要 |
The invention comprises a Werner complex of general formula Ni(SCN)2Xn which is insoluble, or sparingly soluble, in water at room temperature, wherein X is an alpha-arylalkylamine of the formula <FORM:0994027/C2/1> in which R1 is either hydrogen or a primary alkyl group and R2 is a phenyl group carrying two further halogen substituents on the 3- and 4-positions, and n is either 2 or 4. R1 preferably contains 1 to 10, more particularly 1 to 6, carbon atoms. The halogen substituents are conveniently identical and may be chlorine or bromine. The complexes are made, according to an example, by adding a solution of the arylalkylamine in heptane, or heptane-chloroform mixture, at room temperature to an aqueous solution obtained by dissolving NiCl2.6H2O and KSCN in water, and separating the resulting precipitate by filtration. Specific examples of amines are a (3,4-dichlorophenyl) ethylamine, a (3,4 - dichlorophenyl) butylamine, a (3,4 - dichlorophenyl) heptylamine, a (3,4 - dibromophenyl) ethylamine. They may be prepared by reductive amination of the corresponding ketones, for instance by heating with ammonium formate. Specifications 931,775, 935,099, 937,791 and 945,012 are referred to.ALSO:Clathrates of aromatic hydrocarbons are made using a Werner complex of the general formula Ni(SCN)2Xn, wherein X is an alpha-arylalkylamine of the formula <FORM:0994027/C4-C5/1> in which R1 is either hydrogen or a primary alkyl group and R2 is a phenyl group carrying two halogen substituents on the 3- and 4-positions, and n is 2 or 4. The clathrates may be made heating a complex Ni(SCN)2X4 with one or more clathratable aromatic hydrocarbons to a temperature at which all the complex is dissociated into Ni(SCN)2X2 and 2X, and then cooling to effect recombination of the components to form the clathrate. Alternatively a complex Ni(SCN)2X2, at least two motor equivalents of amine X and at least one clathratable aromatic hydrocarbon are mixed together to form a clathrate in which the complex is Ni(SCN)2X4. A mixture of aromatic hydrocarbons containing at least one such clathratable compound can be resolved by forming a clathrate with a complex of the type Ni(SCN)2X4 and the clathratable compound or compounds in the mixture, separating the clathrate from the mixture and dissociating the clathrate, e.g. by heating, treatment with an acid which does not react with the clathrated compounds, steam stripping or elution with an inert solvent. In examples, isomers of di-isopropylbenzenes, cymenes, ethylisopropylbenzenes, cyclohexyltoluenes, and methylnaphthalenes are separated. Specifications 931,775, 935,099, 937,791 and 945,012 are referred to. |
