Craig A. Sams

The effect of torsion angle on the rate of intramolecular triplet energy transfer

The magnitude of electronic coupling between the terminal chromophores shows a precise dependence on the dihedral angle around a bridging biphenyl group.

Controlling the torsion angle via adventitious cation binding

Abstract We report herein the synthesis of a linear binuclear ruthenium(II) complex, and the corresponding free ligand, for which the organic connector is a geometrically-constrained crown ether that binds added cations.

Building molecular-scale bridges having restricted rotation

Abstract The synthesis is reported of a binuclear ruthenium(II) bis(2,2′:6′,2″-terpyridine) complex for which the polytopic ligand incorporates a central, torsionally-constrained biphenylene group. In principle, the dihedral angle between the two phenylene rings can be controlled by the length of the constraining strap.

Conformational control of electron delocalisation in geometrically-constrained, binuclear ruthenium(II)bis(2,2′:6′,2″-terpyridine) complexes

On the basis of temperature-dependent emission studies made with the target binuclear compounds, it is concluded that the extent of electron delocalisation at the triplet level depends on the torsion angle imposed by the bridge.

Synthesis of a biphenyl-based cyclophane via benzidine rearrangement of a constrained m-nitrophenol derivative

Abstract The benzidine rearrangement of a constrained m -nitrophenol derivative results in production of a cyclophane comprising a biphenyl group and a polyether tether connected at the 4,4′ positions.