Alkali and alkaline-earth metal complexes of different nuclearities with azamacrocyclic pendant-arms ligands

The crystal structure of [NaL1](ClO4), [BaL1](ClO4)2 · 2CH3CN and [Ca2L2(μ-ClO4)(H2O)2](ClO4)2 · Cl · (H2O)0.5 could be also determined. The crystal structure of the Na(I) and Ba(II) complexes with L1 show endomacrocyclic mononuclear species, where the metal ions are in N8 and N10 coordination environment, respectively. The geometry around the metal ions can be described as cube and bicapped cube geometry for Na(I) and Ba(II), respectively. Instead, the crystal structure of the Ca(II) compound with L2 shows an exomacrocyclic dinuclear complex where both metal ions are in a similar N5O2 environment joined through a bidentate perchlorate anion. The coordination geometry for both Ca(II) ions can be better described as distorted pentagonal bipyramid.