The H-1-H-2, O-17-H-1 coupling constants and the O-16/O-18 induced proton isotope shift in waterстатья
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Аннотация:At very low concentration in nitromethane the coupling constants J(H,D) and J(O-17,H) of the water molecule at 353 K are found to be 1.091(+/-0.005) and 80.6(+/-0.1) Hz, respectively. The high accuracy was achieved by lineshape analysis using the QUADR program for the proton resonance and temperature variation for the O-17-resonance. Measurements of the proton isotope shift due to O-16/O-18 substitution reveal no noticeable shift in contradiction to an early reported detection by others. (C) 1997 Elsevier Science B.V.