Long-lived osmium(II) chromophores containing 2,3,5,6-tetrakis(2-pyridyl)pyrazine

Characterization of excited electronic and vibronic states of platinum metal compounds with chelate ligands by highly frequency-resolved and time-resolved spectra

“…[Os(bpy)3] 2+ or related Os(II)-compounds have been studied less frequently than [Ru(bpy)3] 2 § but there are a number of very interesting investigations in physical, chemical, and biological research fields [21,[271][272][273][274][275][276][277]. Moreover, Os(II)-bipyridine complexes represent suitable building blocks in connection with Ru(II)-polypyridine compounds for supramolecular systems [278,279] [280][281][282][283].…”

Synthesis and spectroscopic characterization of tin(II) and tin(IV) complexes containing 2,3,5,6-tetrakis(alpha-pyridyl)pyrazine as a bridging ligand

“…In turn, the 119 Sn Mössbauer data of the Sn(IV) adducts corroborate the conclusions from the 119 Sn NMR spectra. This shows that TPP acts as a bisbidentate 1 ligand in both solution and the solid state and leads to the conclusion that no dissociation of complexes 1 to 5 in coordinating solvents (DMF-d 7 or CD 3 CN) occurred. Table 1 gives the 119 Sn Mössbauer parameters for the precursors and products.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] The seven chelating modes hitherto encountered for TPP are illustrated in Figure 1. The reactivity of this ligand towards transition metal species has attracted considerable attention over the past twenty years.…”

“…The reactivity of this ligand towards transition metal species has attracted considerable attention over the past twenty years. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] However, studies of reactions between TPP and main group metal compounds are absent in the literature. Owing to this paucity of information, we decided to investigate the reactivity and coordinating behavior of TPP towards Sn(II) and Sn(IV) compounds, namely SnCl 2 , SnX 4 (X = Cl or Br), SnRCl 3 (R = Ph or Me), and SnPh 2 Cl 2 .…”

A trimetallic supramolecular complex of osmium(II) and rhodium(III) displaying MLCT transitions in the near-IR

“…Mixed ligand osmium(II) complexes of 2,2 0 :6 0 ,2 00 -terpyridine (tpy, Fig. 1) have proven more difficult to prepare and purify due to ligand scrambling [11]. Nonetheless, the [(tpy)OsCl(N-N 0 )] + structural motif holds promise to generate stable, near-IR absorbing supramolecular assemblies (N-N 0 = chelating diimine ligand).…”