Time-resolved spectroscopic characterization of photo-induced valence tautomerism for a cobalt–dioxolene complex

Straightforward Synthesis of Substituted p‐Quinones: Isolation of a Key Intermediate and Use as a Bridging Ligand in a Diruthenium Complex

“…[15] In addition, the creation of quinone-based molecular magnets is a lively field of research that has produced many interesting results. [16][17][18][19][20] 2,5-Diamino-1,4-benzoquinone 1 [21] and its substituted derivatives [22,23] have been known for decades. The synthesis of 1 has previously been reported and such syntheses are rarely straightforward one-pot reactions.…”

Triethylantimony(V) complexes with bidentate O,N-, O,O- and tridentate O,N,O′-coordinating o-iminoquinonato/o-quinonato ligands: Synthesis, structure and some properties

“…Unusual and interesting phenomena have been observed on o-quinonato/o-iminoquinonato complexes. Among them are ''photo/thermomechanical effect" [1][2][3], valence tautomerism [4][5][6][7][8][9][10][11][12][13], ''wandering valence", elementotropy [14] etc. Transition metal o-semiquinonato/o-iminosemiquinonato (SQ/ISQ) complexes demonstrate a versatility of structural types, different types of magnetic exchange depending on complex structure as well as the nature of central atom and ligands [7,[15][16][17][18][19][20], etc.…”

Effects of secondary ligand and excitation on the thermally induced and photoinduced valence tautomerism semiquinonate – catecholate

“…If the resulting LS Sq-Ct complex is excited with visible light (around 532 nm) below 50À60 K, it undergoes photoinduced ligand-to-metal charge transfer (LMCT), whereupon the initial HS bis-Sq complex is recovered -a process which can be conveniently assessed by monitoring the magnetization of the sample [2-7,9,10]. Ultrafast timeresolved spectroscopic studies unraveled two consecutive processes, formation of the HS Co(II) complex followed by equilibration with the reactant [12][13][14]. The lifetime of the photoinduced HS metastable state is in the order of nanoseconds in solution [13,15], but it is extended up to several hours in the solid state [6].…”