Introduction
N-donor aromatic hydrocarbons, such as pyridine and its structural analogs represent a class of extremely valued ligands and ubiquitously have played important roles in the development of coordination chemistry.[1-6] Interestingly, the heteroatom substitution in the aromatic hydrocarbons introduces Lewis basicity due to σ-lone pair of nitrogen and Lewis acidity due to C-N π*-orbitals.[6-9] Moreover, the interactions of these classes of compounds with the transition metal fragments could be widely varied from the formation of σ-type or π-type complexes. Accordingly, a wide variety of N-based aromatic hydrocarbon ligands has been designed and synthesized in order to generate organometallic compounds with diverse structures, shapes, nuclearity and dimensionality.[3,6,10,11] The diversity in the chemistry of such ligands have been heavily utilized for different applications in the field of biomedical applications, thermal reaction batteries, semiconducting materials and catalysis.[12-16]