CRYSTAL-STRUCTURE OF ACETANILIDE AT 15 AND 295 K BY NEUTRON-DIFFRACTION - LACK OF EVIDENCE FOR PROTON-TRANSFER ALONG THE N-H-CENTER-DOT-CENTER-DOT-CENTER-DOT-O HYDROGEN-BOND

被引:56
作者
JOHNSON, SW
ECKERT, J
BARTHES, M
MCMULLAN, RK
MULLER, M
机构
[1] LOS ALAMOS NATL LAB,LANSCE,LOS ALAMOS,NM 87545
[2] UNIV MONTPELLIER 2,GDPC,F-34095 MONTPELLIER 5,FRANCE
[3] BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973
[4] UNIV LILLE 1,DSCM,F-59655 VILLENEUVE DASCQ,FRANCE
关键词
D O I
10.1021/j100044a009
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The crystal structure of acetanilide C8H9NO, M(r) = 135.17, orthorhombic, space group Pbca, Z = 8, has been determined from neutron diffraction data at 15 and 295 K. The following are the crystal data: at 15 K [295 K], a = 19.467(3) [19.615(3)] Angstrom, b = 9.332(1) [9.474(1)] Angstrom, c = 7.735(1) [7.979(1)] Angstrom; V = 1405.2(6) [1482.8(6)] Angstrom(3); D-n = 1.2779(1) [1.2110(5)] g . cm(-3), mu(n), = 2.14 [2.02] cm(-1), F(000) = 277.46 fm, lambda = 1.0462 Angstrom, R(F-2) = 0.047 [0.083], wR(F-2) = 0.060 [0.076], and S = 1.033 [1.000] for 2772 [1596] reflections (sin theta/lambda < 0.79 [0.68] Angstrom(-1)) and 173 variable parameters. This new investigation of the structure of acetanilide has been undertaken in order to assess a recent suggestion that conformational substates in the amide proton position may be responsible for the vibrational anomalies. We found no evidence for multiple conformations or transfer along the N-H ... O hydrogen bond of the amide proton at either temperature. However, the intramolecular O ... H6 distance from O to the nearest phenyl ring proton is unusually short and the amide proton has relatively close contacts with one of the phenyl and one of the methyl protons, which may well affect the vibrational parameters of the respective molecular groups.
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页码:16253 / 16260
页数:8
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