Ph. D. THESIS 2009

a b
Figure 29. 3D FTIR spectra in solution recorded at different concentrations of syn
isomer in a 1:1 mixture of CHCl 3 and C 2Cl 4: a) 2800-3750 cm -1 ; b) 3660-3740 cm -
1 .
2.4. Investigation of bicyclo[3.3.1]nonane-3,7-dione dioxime in solid state
The solid state FTIR investigations revealed for both 5-syn and 5-anti structures
the recording of only the O-H absorption bands corresponding to the H bonds
associated molecules. The infrared spectra for the dioxime isomers in solid
state do not show an absorption around 3600 cm -1 , characteristic of free OH
[38].
a b
Figure 30. FT-IR spectrum of: a) 5-anti dioxime b)5-syn dioxime, dispersed
in KBr matrix
They tend to establish H-bond in solid state and the O-H stretching frequencies
are shifted to 3328-3281 cm -1 and 3190-3109 cm -1 for anti and syn
configuration, respectively (Figure 30).
2.4.2. Single crystal X-ray diffraction
38