Synthesis of triple cyclam (1,5,9,12,16,20,24,27-octaazatricyclo[18.10.2.25,16]tetratriacontane) and its 36-membered analogue 1,5,9,13,17,21,25,29-octaazatricyclo[19.11.2.25,17]hexatriacontane and studies of their co-ordinating properties in solution and the solid state