RSC Advances

Pal, Suman; Hatai, Joydev; Srikanth, K.; Bandyopadhyay, Subhajit

doi: 10.1039/c3ra23089apmid: N/A

Binding of a Cu2+ ion to the closed form of a photochromic ligand is tight, whereas, to the open form, it is more than tenfold weaker. This is the first demonstration of a reversible photomodulation of the binding of a metal ion using a dimethyldihydropyrene based system.

Ellingsworth, Edward C.; Turner, Brittany; Szulczewski, Greg

doi: 10.1039/c3ra22534hpmid: N/A

Heating the spin-crossover (SCO) complex FeII(phen)2(NCS)2 (phen = 1,10-phenanthroline) under high vacuum results in the formation of red films that have been identified as [FeII(phen)3](SCN)2 by IR, Raman, and UV-Vis spectroscopy. After annealing the red films to ∼140 °C under vacuum, purple (paramagnetic) films form and have been identified as Fe(phen)2(NCS)2 by SQUID magnetometry, X-ray photoelectron, Raman and IR spectroscopy. The Fe(phen)2(NCS)2 films exhibit a SCO transition at ∼180 K with a broadened transition temperature range between the high-spin and low-spin states (∼20 K) when compared to the bulk phase, which is ascribed to a broad distribution of molecular environments.

doi: 10.1039/c3ra90018epmid: N/A