EN
The aim of the study was to examine the structure of liquid 2-chloronaphthalene C_{10}H_7-Cl at 353 K by the X-ray diffraction method. Monochromatic radiation Mo K_α,λ= 0.71069Å was used to determine the scattered radiation intensity between S_{min}=4πsinθ_{min}/λ=0.430Å^{-1} and S_{max}= 4π sinθ_{max}/λ=14.311Å^{-1}. The curves of reduced intensity were analysed by the reduction method of Blum and Narten. Experimental distribution of X-ray scattered intensity was compared with theoretical results predicted for a proposed model of 2-chloronaphthalene molecule. The differential radial distribution function 4π r^2Σ_{j,k}^n K_j[ρ_k(r)-ρ_0] was calculated and some intra- and intermolecular distances in liquid 2-chloronaphthalene were determined. X-ray structural analysis was applied to determine the packing coefficient of 2-chloronaphthalene molecules at 353 K. The intermolecular distance Cl ··· Cl' was also determined as 7.90±0.15Å. A simple model of short-range arrangement of the molecules was proposed, which seems to be valid for other weakly polar monosubstituted naphthalene derivatives in the liquid phase.