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• 854650-62-7 N,N'-dinitro-N,N'-dipicryl-propanediyldiamine 

Relevant academic research and scientific papers

Diaminoalkane and oxidation colorants

A diaminoalkane of general formula (I) in which R1 to R10 stand independently of each other for hydrogen, a (C1 -C4)-alkyl group, a hydroxy-(C2 -C3)-alkyl group, a (C1 -C4)-alkoxy-(C2 -C3) alkyl group, an amino- (C2 -C3) alkyl group or a 2,3-dihydroxypropyl group and n is a number from 1 to 6 with the proviso that the --NR1 R2 and --NR7 R8 groups are either in positions 4 and 4' or in positions 5 and 5'. Salts of the diaminoalkane which are physiologically compatible with inorganic and organic acids. Method of coloring keratin fiber.

Chromatographic approach to the measurement of the interstrand distance for some chiral bonded phases

A series of homologous N,N′-bis(2,4-dinitrophenyl)-α,ω-diaminoalkanes (bis-DNP's) was chromatographed at various temperatures on π-basic chiral stationary phases derived from N-(2-naphthyl)alanine in order to determine the enthalpy and entropy of adsorption. The number of methylene groups in the bis-DNP's influences the ability of the terminal π-acidic groups to interact simultaneously with neighboring strands of stationary phase, a process termed "bridging". When the number of methylene groups is optimal for bridging, the enthalpy of adsorption is most exothermic. The length of the bis-derivative required for optimal bridging is related to the interstrand distance. Optimal bridging occurs for the bis-DNP's having five methylene groups regardless of the extent of surface coverage of the silica for the surface coverage range investigated. This suggests that the strands are not randomly spaced on the silica, with interstrand distance being influenced only by surface coverage, but are instead clustered, the clusters having similar distributions of interstrand distances. Adsorption is more exothermic for phases of high surface coverages than for low. If Interstrand spacing is independent of surface coverage but surface coverage affects the enthalpy of adsorption, then surface coverage must influence the cluster size, which then influences the average extent of solvation of a strand of bonded phase.