A perfluorocyclopentene based diarylethene bearing two terpyridine moieties - synthesis, photochemical properties and influence of transition metal ions.

The synthesis of a perfluorocyclopentene based diarylethene bearing two terpyridine units is reported. Furthermore studies of the free ligand's photochromism and investigations regarding the influence of various transition metal ions on the photochromic reaction are presented. The photochromism of the central diarylethene unit is strongly dependent on the transition metal present, vice versa the photochromic reaction seems to influence the MLCT transition of a binuclear Ru(II) complex.

Anthracene functionalized terpyridines - synthesis and properties.

The synthesis of several symmetrically 4,4''-functionalized 2,2':6',2''-terpyridines is reported. In addition to the biscarboxylic acid 4,4''-tpy(CO₂H)₂ (3), the anthryl esters 4,4''-tpy(CO₂CH₂Anth) ₂(5a) and 4,4''-tpy(CO₂CH₂CH₂OAnth)₂ (5b) were synthesized. Furthermore, both anthryl esters were used to synthesize symmetric iron(II)-bis(terpyridine)complexes 6a-b.

Hydrodefluorination of pentafluoropyridine at rhodium using dihydrogen: detection of unusual rhodium hydrido complexes.

The pentafluoropyridyl complex [Rh(4-C5NF4)(PEt3)3] (3) reacts with H2 to give initially the dihydrido complex cis-mer-[Rh(H)2(4-C5NF4)(PEt3)3] (6). Within a few hours 2,3,5,6-tetrafluoropyridine as well as two rhodium(III) complexes mer-[Rh(H)3(PEt3)3] (mer-) and fac-[Rh(H)3(PEt3)3] (fac-) are formed. A catalytic C-F activation process for the formation of 2,3,5,6-tetrafluoropyridine starting from pentafluoropyridine and dihydrogen using 3 as a catalyst has been developed.