Titanium(iv)-based helicates incorporating the ortho-phenylenediamine ligand: a structural and a computational investigation.

The multicomponent coordination chemistry involving Ti(OPr), the ortho-phenylenediamine ligand (opda) and 2,2'-biphenol-based proligands (LH and LH) is described. The proligands LH and LH incorporate two and three 2,2'-biphenol units linked with p-phenylene bridges (p-PLB) respectively. We demonstrate that this selected set of components allows the spontaneous formation of neutral double-stranded helicates.

A bowl-shaped circular trinuclear helicate generated from a TiO4 N2 motif by a multicomponent self-assembly approach.

The synthesis of a bowl-shaped trinuclear circular titanium-based helicate is reported. The strategy allowing access to this neutral architecture is based on a multicomponent self-assembly approach in which the ligands involved in the process are a bis-biphenol strand and 2,2'- bipyrimidine. By reacting the bis-biphenol ligand and 2,2'-bipyrimidine with an equimolar amount [Ti(OiPr)4 ], a bowl-shaped architecture is obtained through the formation of 18 new coordination bonds.

Sequence-controlled polymerization using dendritic macromonomers: precise chain-positioning of bulky functional clusters.

A simple strategy to insert functional dendrons at precise positions along a linear polymer backbone is reported. Sequence controlled copolymerization of styrene and polyester dendrons containing a maleimide unit at their focal points was utilized to yield such polymers.