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8712768 
Journal Article 
Matrix induced localization of proton tunneling in malonaldehyde 
Firth, DW; Barbara, PF; Trommsdorff, HP 
1989 
Yes 
Chemical Physics
ISSN: 0301-0104 
136 
2 
349-360 
English 
The infrared spectrum of malonaldehyde (MA) isolated in an argon matrix has been studied in the frequency range 4000-270 cm-1 at temperatures between 15 and 30 K. In addition, the ultraviolet spectrum of MA isolated in cyclohexane crystals has been studied in the frequency range 28100-30700 cm-1 at temperatures between 1.2 and 50 K. In contrast to the previously observed gas phase spectrum of MA, no tunneling splitting due to proton motion in a double minimum potential is apparent in the spectrum of matrix isolated MA. Furthermore, the relative intensities of the MA bands are not temperature dependent in contrast to expectations for a tunneling system. These results strongly suggest that matrix/MA interactions localize the proton on the time scale of the infrared and optical experiments. 1989.