Bo Møller Petersen

Synthesis and non-linear optical properties of mono-pyrrolotetrathiafulvalene derived donor–π–acceptor dyads

The synthesis of novel donor–π–acceptor dyads based on a pyrrolo-annelated tetrathiafulvalene unit is described. The linear and non-linear optical properties of these chromophores have been investigated, together with their redox properties. For a dyad containing a p-nitrophenyl acceptor group, a significant third-order optical non-linearity is observed.

The Introduction of Pyrrolotetrathiafulvalene into Conjugated Architectures: Synthesis and Electronic Properties

A series of new conjugated copolymers incorporating the redox-active pyrrolo-TTF unit has been synthesised. The properties of the polymers have been investigated by cyclic voltammetry and electronic absorption spectroscopy, revealing that the pyrrolo-TTF behaves very differently to its thieno-TTF variant. In comparison to thieno analogues, the band gaps of the new polymers are wider than expected due to a decrease in the polarizability of the heteratom (nitrogen vs. sulfur) and steric interactions between repeat units. Whilst the pyrrolo-TTF units are stronger electron donors than thieno-TTFs in related structures, the two redox active elements of the new polymers (TTF and conjugated chain) function independently under oxidative conditions.

A bromine catalysed dimerisation of α,α' -dihalomonopyrrolo -TTF

Dihalomonopyrrolo-TTF undergoes a bromine catalysed dimerisation reaction to yield a novel type of extended TTF derivative.

Monopyrrolotetrathiafulvalenium dication and its complexation with 1,5-dinaphtho[38]crown-10

The synthesis and characterisation of a monopyrrolotetrathiafulvalene dication 1 2+, isolated both as its perchlorate (ClO4 − ) and hexachloroantimonate (SbCl6 –) salt, is described. The complexation between the π-electron acceptor 1 2+ and the π-electron donating macrocyclic polyether 1,5-dinaphtho[38]crown-10 (1/5DN38C10) has been investigated using 1H NMR spectroscopy and a binding constant (K a) of 3.7 ± 0.3 × 102 M–1 was obtained for the 1 2+ ⊂ 1/5DN38C10 complex (as its perchlorate salt) in acetonitrile at 298 K. The results reveal that the strength of the binding between 1 2+ and 1/5DN38C10 is one order of magnitude smaller than that for the binding between the parent tetrathiafulvalene (TTF) dication (i.e. TTF2+) and 1/5DN38C10.

4,5-Bis(hydroxy­meth­yl)-1,3-dithiole-2-thione

At 180 K, the title compound, C5H6O2S3, forms a three-dimensional hydrogen-bonded network in which the H atoms of the hydroxyl groups are disordered.