www.rsc.org/njc Volume 33 | Number 8 | August 2009 | Pages 1621–1792 ISSN 1144-0546 1144-0546(2009)33:8;1-W New Journal of Chemistry An international journal of the chemical sciences PAPER Marina S. Fonari et al. Conformational mobility of 7,16-bis(4- methoxybenzyl)-1,4,10,13-tetraoxa-7,16- diazacyclooctadecane in molecular and proton-transfer complexes