Re(CO)-based neutral heteroleptic tetrahedrons

Four new flexible ditopic nitrogen donors possessing a xylene spacer and 2-phenylbenzimidazolyl or its derivatives as a coordinating unit and one rigid bis-chelating ligand consisting of two 2-hydroxyphenylbenzimidazolyl motifs and a central phenylene spacer were synthesized and further used with Re 2 (CO) 10 for making a new family of neutral, heteroleptic tetrahedral-shaped supramolecular coordination complexes via a one-pot approach. The new ligands and the complexes were characterized using various analytical and spectroscopic methods. The molecular structures of the complexes were determined using single crystal X-ray diffraction analysis, which reveal that four rhenium cores are arranged in the vertices, and four ligands are at the edges of the tetrahedron. fac -Re(CO) 3 -based synthetic approach i.e. , combination of rigid dianionic bis-chelating donor, flexible neutral ditopic nitrogen donor and Re 2 (CO) 10 , for neutral, heteroleptic tetrahedral shaped supramolecular coordination complexes was designed.