Abstract
New lanthanide complexes with the trans-disubstituted macrocyclic ligand Py2[18]aneN6 (denoted as L1) were successfully synthesized. The coordination properties of compound L1 towards different lanthanide metal ions (Ln = La–Yb, except Lu) were explored, and structural studies have been carried out both in the solid state and in aqueous solution. In all cases, complexes with a 1:1 metal:ligand molar ratio were obtained. The crystalline structures of the following compounds: [H4L1](NO3)4, [CeL1(NO3)2](NO3) and [SmL1(NO3)2](NO3) have been characterized by single crystal X-ray diffraction. In both complexes, the asymmetric unit contains the cation complex [LnL1(NO3)2]+ (Ln = Ce3+, Sm3+) which consist of a mononuclear endomacrocyclic backbone whilst the ten coordination environment is completed by two bidentade nitrate ions. The two five membered chelate rings formed by the ethylenediamine moieties adopt (δδ) [or (λλ)] conformations and also presented a C2 symmetry (as observed in solution by NMR).
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