Titanium-Based Molecular Architectures Formed by Self-Assembled Reactions

The design of highly ordered supramolecular structures has gained more and more interest within the last few decades. The concept of self-assembly chemistry takes a key position in this field and a multitude of supramolecular compounds have been synthesized by combining simple building blocks to two- and three-dimensional structures [1-3]. Due to their electronic and steric versatility aromatic N-heterocycles play a prominent role as classical ligands in coordination compounds, [4,5] as bridging ligands in binuclear derivatives [6-8] and as building blocks for supramolecular compounds [9-17]. Beyond their capability to connect metal centers by forming ligand to metal bonds they provide the opportunity of pi-backbonding and thereby may affect delocalization and transport of electrons [18]. Compared with the highly developed late transition metal supramolecular chemistry, only a few attempts have been made to use the well defined coordination modes and the reducing properties of early transition metals [19,20].