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Title: | PMR studies on N-methyl formamide oriented in a liquid crystalline nematic phase |
Authors: | Khetrapal, C.L. Kunwar, A.C. Easwaran, K.R.K. |
Issue Date: | 1975 |
Publisher: | Indian Academy of Sciences, Bangalore, India. |
Citation: | Pramana Supplement, 1975, Vol. 1, p483-494. |
Abstract: | The PMR spectrum of N-methyl formamide dissolved in the nematic phase of 4-methoxybenzylidene-4-amino-α-methyl cinnamic acid-n-propyl ester is reported. The four interproton dipolar coup- lings are derived. Using reasonable values for the bond lengths and the bond angles, it is found that the results are consistent with the molecule having a plane of symmetry containing the fragment H.CO.NH.C. Assuming the H-CO-N fragment to be rigidly planar, this plane of symmetry may ' effectively' arise also from two rapidly interconverting conformations in which the remaining two bonds meeting at the nitrogen atom are bent either below or above this plane; the angles of bend are less than 10°. Information on the mode of rotation of the methyl group about the N-C bond is derived. The results establish that N-methyl formamide contains predominantly the ' trans ' species NH and the C=O groups in the trans position ). In addition, some weak lines, which arise from the ' cis ' species ( NH and the C=O group in the cis position ) present to a much smaller extent are detected. |
Description: | Proceedings of the international liquid crystal conference, Bangalore, 1973. |
URI: | http://hdl.handle.net/2289/908 |
ISSN: | 0304-4289 |
Copyright: | Indian Academy of Sciences, Bangalore, India. |
Appears in Collections: | Research Papers (SCM) |
Files in This Item:
File | Description | Size | Format | |
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1975 Pramana supp. No.1 p483.pdf | 12p. | 445.46 kB | Adobe PDF | View/Open |
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