The dinuclear copper(II) complex of the hexaaza macrocyclic ligand 3,6,9,17,20,23-hexaaza-tricyclo[23.3.1.111,15]triaconta-1(29),11(30),12,14,25,27-hexaene as a host for alanine, valine, leucine, norleucine, norvaline and serine anions