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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 16, Number 1
JKCSEZ 16(1)
February 20, 1972 

The Crystal Structure of Benzidine Dihydrochloride

Benzidine 염산염의 결정구조
Chung Hoe Koo, Hoon Sup Kim, Hyun So Shin

구정회, 김훈섭, 신현소
Benzidine dihydrochloride crystallizes in the triclinic system. The space group is P1. The unit cell dimensions are; a = 4.38±0.01, b = 5.76±0.01, c = 12.82±0.02Å, α = 101.5±0.2, β = 99.5±0.2, γ = 99.5±0.2°; with one molecule per unit cell. The crystal structure has been solved by two dimensional Patterson and by trial and error methods, and refined by means of two dimensional differential synthesis. The bond distances are C-C(*) = 1.40±0.02, C-C = 1.52±0.02, C-N = 1.51±0.03 and N-H…Cl = 3.21±0.03Å. The structure consists of hydrogen bonded molecular layers, extending to the (100) plane, and the hydrogen bonding scheme is similar to that of p-phenylenediamine dihydrochloride. The adhesion between hydrogen bonded molecular layers is due to van der Waals forces.
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