Synthesis and X-ray crystal structure of three polyazamacrocycles having sulfonate pendant groups: Piperazinyl-monomethanesulfonic acid, sodium hydrogen 1,4,7-triazacyclononane-N,N?-di(methanesulfonate) and 1,4,7,10-tetraazacyclododecane-N,N?-di(methanesulfonic acid)