Exploring the Limits of Ligand Rigidification in Transition Metal Complexes with Mono--Functionalized Pyclen Derivatives.

We report the synthesis of a new family of side-bridged pyclen ligands. The incorporation of an ethylene bridge between two adjacent nitrogen atoms was reached from the pyclen-oxalate precursor described previously. Three new side-bridged pyclen macrocycles, H, , and H, were obtained with the aim to assess their coordination properties toward Cu and Zn ions.

Pyclen-Based Ligands Bearing Pendant Picolinate Arms for Gadolinium Complexation.

We report the synthesis of two pyclen-based regioisomer ligands (pyclen = 3,6,9,15-tetraazabicyclo[9.3.1]pentadeca-1(15),11,13-triene) functionalized with picolinic acid pendant arms either at positions () or () of the macrocyclic fragment.

Expanding the Scope of Pyclen-Picolinate Lanthanide Chelates to Potential Theranostic Applications.

A family of three picolinate pyclen-based ligands, previously investigated for the complexation of Y and some lanthanide ions (Gd, Eu), was studied with Tb and Lu in view of potential radiotherapeutic applications. The set of six Tb and Lu complexes was synthesized and fully characterized. The coordination properties in the solid state and in solution were thoroughly studied.