Structural trends in copper(ii) bis(thiosemicarbazone) radiopharmaceuticalsElectronic supplementary information (ESI) available: Fig. A: Comparison of average crystallographic, ?template? and density functional ?optimised? CuATSM (6) bond lengths. Fig. B: Paired N?H?N and N?H?S hydrogen bonding networks in complexes without terminal alkyl groups. Fig. C: Networks of Cu?S and N?H?S hydrogen bonds in complexes with monoalkylated terminal nitrogen atoms. Fig. D: Planar array of non-hydrogen bonded molecules in the crystal of 8. Table A: Displacement (?) of atoms from least squares planes. Table B: Torsional angles. See http://www.rsc.org/suppdata/dt/b3/b307499d/