Ferric ion sequestering agents. 13. Synthesis, structures, and thermodynamics of complexation of cobalt(III) and iron(III) tris complexes of several chelating hydroxypyridinones

Highly Luminescent Lanthanide Complexes of 1-Hydroxy-2-pyridinones

“…Both of the individual 1,2-HOPO rings (defined by C 1 -C 5 and N 1 , and C 12 -C 16 and N 4 ) are planar, with very small root mean square (rms) values (0.0032 and 0.0168 respectively), and the adjacent amide groups (defined by C 6 , O 3 , N 2 and C 11 , O 5 , N 3 ) are similarly also planar. As with similar structures reported previously, 38 these amide groups are not coplanar with the adjacent 1,2-HOPO ring system, instead lying almost orthogonal with dihedral angles of ca. 88.8° and 62.2° respectively.…”

Structural studies of organoboron compounds. XLIV. 2,3-Dihydro-3-hydroxy-2,2-tetramethylene-4H-benzoxazin-4-one and its difluoroboron chelate, 2,2-difluoro-4,4-tetramethylene-1,3,5-trioxa-3a-azonia-2-borata-2,3,4,5-tetrahydro- 1H-cyclopenta[a]naphthalene

“…Besides an ORTEP diagram of 5-methoxy-6-methyl-I-hydroxy-2(lH)-pyridinone without further structural data (7) and some calculated bond lengths for 1-hydroxy-2(lH)-pyridinone (8) raphic characterization of a 1-hydroxy-2-pyridinone derivative is that reported (9) dimers are present in the solid-state structure of free salicylohydroxamic acid (10). This is in contrast to the intramolecular hydrogen bond in 14, the "chelated proton" being located from a difference Fourier synthesis (9). Nevertheless, an intramolecular hydrogen bond can be expected for compound 2 in non-polar solvents or in the gas phase, and is indirectly demonstrated by the replacement of the chelated proton by the borenium ions Ph2B+ (in compound 3) or F2B+ (in compound 6).…”

Crystal structure of dicarbonyl(pyridin-2-olate-1-oxido-κ2 O,O′)rhodium(I), C7H4NO4Rh

“…This study forms part of research in our group on the relationships of structure and [6][7][8][9][10][11]. Crystal structures of dicarbonyl rhodium(I) complexes with di erent bidentate ligands have been less studied [12][13][14][15]. A precursor [Rh(BID)(CO) 2 ] where (BID) represents di erent monocharged bidentate ligands have been studied as a catalyst [16].…”