Crystal chemistry of protonated 1,2-bis(di-R-aminomethyl)benzenes - Part III. 1,2-bis(diethylaminomethyl)benzene perchlorate

The crystals of the 1:1 complex of 1,2-bis(diethylaminomethyl)benzene with HClO4 were studied using X-ray diffraction and FT-IR spectroscopy. The spac e group is P2(1)2(1)2(1) with a = 8.677(2), b = 14.255(3), c = 15.167(3) An gstrom and Z = 4. The N+-H...N intramolecular hydrogen bond deviates from s trict symmetry with N ... N = 2.732(5) Angstrom, N(2)... H(1) = 1.49 Angstr om and N-H ... N = 155 degrees. The IR spectrum of the crystals shows a ver y broad intense band in the region 2700-1600 cm(-1) and weak continuous abs orption at lower wavenumbers, indicating relatively large proton polarizabi lity in the intramolecular hydrogen bond. (C) 1999 Elsevier Science B.V. Al l rights reserved.