Formation of a supramolecular assembly between a Na(+)-templated G-quartet and a Ni(II)-porphyrin complex.

Formation of a π-π stacked assembly between a Na(+)-templated G-quartet and octaethylporphyrinatonickel(II) was observed by spectroscopic methods in methanol/chloroform and the formation dynamics of the assembly was elucidated.

Quartet formation of a guanine derivative with an isopropyl group: crystal structures of "naked" G-quartets and thermodynamics of G-quartet formation.

The formation of guanine quartets with 9-isopropylguanine ((i)PG) is discussed in organic solvents. Crystal structures of the (i)PG quartets were determined by X-ray crystallography with template cations (Na(+) and Ca(2+)) and the structure without a template cation was also obtained by virtue of the stabilization by intermolecular hydrogen bonding with water molecules of crystallization. The difference in the quartet formation of (i)PG in the presence and absence of a template cation was clearly demonstrated by (1)H NMR measurements in CDCl(3)-CH(3)OH mixed solvents.

A triangular prismatic hexanuclear iridium(III) complex bridged by flavin analogues showing reversible redox processes.

[Ir(6)(μ-alloCl(2)(2-))(3)(Cp*)(6)(OH)(3)](PF(6))(3) (1) having 7,8-dichloroalloxazine dianion (alloCl(2)(2-)) as bridging ligands was synthesized and characterized by X-ray crystallography, spectroscopic and electrochemical measurements. The alloxazine ligands showed unprecedented coordination modes to link the six Ir(III) centres. The complex exhibited remarkable stability and reversible six-electron redox processes at the bridging alloxazine ligands in organic solvents.

A tetranuclear iridium(iii) complex with a flavin analogue as a bridging ligand in different coordination modes and exchangeable anion encapsulation in a supramolecular cage.

A novel tetranuclear Ir(iii) complex involving unprecedented coordination modes of alloxazine formed a closed pi-space by intermolecular hydrogen bonding and the counter anions encapsulated in the space could be exchanged via self-assembly.