Widely varying luminescence spectra are reported for 1-D chains of bis(dithiocarbamato)gold(I) dimers. Variable pressure luminescence spectra elucidate the effect of angular overlap on the emission properties of the aurophilic chain.

Two luminescent heteroleptic Ru complexes with a 2,2'-biimidazole (biimH ) ligand form doubly hydrogen-bonded salt bridges to 4-sulfobenzoate anions in single crystals. The structure of one of these cation-anion adducts shows that the biimH ligand is deprotonated. Its MLCT luminescence band does not shift significantly under the influence of an external hydrostatic pressure, a behavior typical for these electronic transitions. In contrast, hydrostatic pressure on the other crystalline cation-anion adduct induces a shift of proton density from the peripheral N-H groups of biimH towards benzoate, leading to a pronounced redshift of the MLCT luminescence band. Such a significant and pressure-tunable influence from an interaction in the second coordination sphere is unprecedented in artificial small-molecule-based systems.

Near room temperature hysteretic thermo-induced valence tautomerism was discovered in a layered 2D-coordination polymer of manganese(II) with nitronyl nitroxyde radicals separated by ClO4‾ anions (1). This opens a novel approach...

Under a mild external pressure of 0.1 GPa valence tautomeric compounds {[Mn2(NITIm)3]X}n with nitronyl nitroxide radical NITIm and X = ClO4− or BF4− have their conversion shifted upwards by almost 40 K with respect to room temperature.