CRYSTAL-STRUCTURE AND HYDROGEN-BOND IN MONOCHLOROACETATES, DICHLOROACETATES, AND TRICHLOROACETATES OF 4-METHYLANILINE AND 3,4-DIMETHYLANILINE - AN X-RAY AND CL-35 NQR INVESTIGATION

The Cl-35 NQR spectra of the mono-, di-, and trichloroacetates of 4-methylaniline and 3,4-dimethylaniline, [4-(CH3)C6H4NH3+] [Cl(3-n)H(n)CCOO-] and [3,4-(CH3)2C6H3NH3+] [Cl(3-n)H(n)CCOO-], n = 0,1,2, were studied in the range 77 less-than-or-equal-to T/K less-than-or-equal-to T(decomposition) or T(bleaching out). Whereas for the monochloroacetates of both aniline derivatives the Cl-35 NQR is observable up to T > 353 K, broadening of the Cl-35 NQR lines of both groups, -CHCl2 and -CCl3, lead to a bleaching of the NQR signals in the range 114 less-than-or-equal-to T/K less-than-or-equal-to 280, far below the decomposition temperature of the respective compound. The crystal structures of [4-(CH3)C6H4NH3+] [Cl2HCCOO-] and of [3,4-(CH3)2C6H3NH3+] [Cl(3-n)H(n)CCOO-], n = 0, 1 were determined at room temperature. The results of both, diffraction experiments and Cl-35 NQR are compared and discussed.