Quantifying Weak Hydrogen Bonding in Uracil and 4-Cyano-4‘-ethynylbiphenyl: A Combined Computational and Experimental Investigation of NMR Chemical Shifts in the Solid State
作者:Anne-Christine Uldry、John M. Griffin、Jonathan R. Yates、Marta Pérez-Torralba、M. Dolores Santa María、Amy L. Webber、Maximus L. L. Beaumont、Ago Samoson、Rosa María Claramunt、Chris J. Pickard、Steven P. Brown
DOI:10.1021/ja075892i
日期:2008.1.1
conventional NH...O hydrogenbonding. A comparison of CH bond lengths for geometrically relaxed uracil molecules in the crystal structure and for geometrically relaxed isolated molecules reveals differences of no more than 0.002 A, which corresponds to changes in the calculated 1H chemical shifts of at most 0.1 ppm. For the C[triple bond]CH...N[triple bond]C weak hydrogenbonds in 4-cyano-4'-ethynylbiphenyl