The Crystal and Molecular Structure of Dipropargyldiphenylmethane

디프로파질디페닐메탄의 결정 및 분자구조

  • Ahn Choong Tai (Department of Chemistry, Hankuk University of Foreign Studies) ;
  • Choi Sam-Kwon (Department of Chemistry, Korea Advanced Institute of Science and Technology)
  • 안중태 (한국외국어대학교 문리과학대학 화학과) ;
  • 최삼권 (한국과학기술원 화학과)
  • Published : 1993.05.20

Abstract

Dipropargyldiphenylmetane, $C_{19}H_{16}, crystallizes in a monoclinic space group $C2/_c$$ with a = 11304(3), b = 20.799(5), c = 6.622(2)${\AA}$, ${\beta} = 112.8(3)^{\circ}$, Z = 4, V = 1435.3${\AA}^3,\;F(000)\;=\;520,\;D_c\;=\;1.14g{\cdot}cm^{-3}$ and ${\mu}\;=\;0.32\;cm^{-1}$. The structure was solved by direct methods and all non-H atoms were identified in the E-map. The final refinement gave R = 0.055 from 1328 unique observed reflections with I $\geq$ -1.0 $\sigma(I).$ The molecule belongs to the point group $C_2$ of Symmetry by possessing the 2-fold axis which coincides witeh the crystallographic symmetry axis in the unit cell. The linear propargyl moiety is nearly $perpendicular(94.2)^{\circ}$ to the molecular plane of the benzene ring. The internal angle of methane carbon atoms in $108.1(1)^{\circ}$, bonding to the benzene and the propargyl moiety with the bond lengths of 1.530(2) and $1.560(2)\AA$, respectively. The shortest contant between the molecules is $3.538(2)\AA$ between C(9) and C(9) (-x, y, -1/2-z).

디프로파질디페니메탄$(C_{19}H_{16})$는 단사정계의 공간군 $C2/_c$에$ 속하며 a = 11304(3), b = 20.799(5), c = $6.622(2)\AA$, $\beta$ = $112.8(3)^{\circ}$, Z = 4, V = $1435.3\AA^3,\;F(000)\;=\;520,\;D_c\;=\;1.14g{\cdot}cm^{-3}$ and $\mu$ = 0.32 cm$^{-1}$이며 I $\geq$ -1.0 $\sigma(I)$인 1328개의 회절반점에 대한 최종 R값은 0.055였다. 직접법에 의하여 구조를 풀었으며 수소를 제외한 모든 원자는 E-map에서 찾았다. 한 분자는 단위세포내에 있는 결정학적 2-회전축과 일치하는 대칭축을 분자내의 메탄의 탄소원자에 가짐으로서 $C_2$ 점군에 속한다. 직선인 프로파질 부분은 벤젠기의 분자평면과 거의 수직$(94.2^{\circ})$을 이루고 있으며, 메탄의 탄소원자의 내부각은 $108.1(1)^{\circ}으로$ 벤젠기와는 $1.530(2)\AA$, 프로파질기와는 $1.560(2)\AA$의 길이로 결합하고 있다. 분자사이의 가장 짧은 접촉은 C(9)과 C(9)(-x,y, -1/2-z)사이의 $3.538(2)\AA$ 이다.

Keywords

References

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