Journal of Molecular Structure p. 129 - 134 (1994)
Update date:2022-08-11
Topics:
Jin, Anding
Zhu, Xiao-Lei
Kirchmeier, Robert L.
Shreeve, Jean'ne M.
Patel, Nimesh R.
Oberhammer, Heinz
The molecular structures of CF3N(CH3)2 and (CF3)2NCH3 have been determined by gas electron diffraction.The following skeletal parameters (ra distances and <α angles) have been obtained for CF3N(CH3)2:C-F=135.1(4) pm, N-CH=148.1(10) pm, N-CF=138.3(16) pm, CHNCH=113.0(27) o, CHNCF=111.9(9) o; (CF3)2NCH3:C-F=133.3(3) pm, N-CH=147.8(13) pm, N-CF=142.0(8) pm, CHNCF=116.8(13) o, CFNCF=117.8(11) o.CH and CF are the methyl and trifluoromethyl carbon atoms, respectively.Experimental uncertainties are 3? values and include possible systematic errors.The most surprising result is the large difference between the N-CH and N-CF bond lengths of about 10 and 6 pm in these compounds.All nitrogen bond angles increase concomitantly with increasing number of CF3 groups.An attempt is made to rationalize the observed structural trends.
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