Uranium complexes supported by an aryloxide functionalised triazacyclononane macrocycle: synthesis and characterisation of a six-coordinate U(iii) species and insights into its reactivityElectronic supplementary information (ESI) available: synthetic and analytical results, including elemental analysis, for all new complexes, crystallographic information for 2 and 3, and computational details for 1, figures and tables. See http://www.rsc.org/suppdata/cc/b2/b208473b/