Different coordination patterns for two related unsymmetrical compartmental ligands: crystal structures and IR analysis of [Cu(C<sub>21</sub>H<sub>21</sub>O<sub>2</sub>N<sub>3</sub>)(OH<sub>2</sub>)(ClO<sub>4</sub>)]ClO<sub>4</sub>·2H<sub>2</sub>O and [Zn<sub>2</sub>(C<sub>22</sub>H<sub>21</sub>O<sub>3</sub>N<sub>2</sub>)(C<sub>22</sub>H<sub>20</sub>O<sub>3</sub>N<sub>2</sub>)]ClO<sub>4</sub>
Journal of coordination chemistry