Unusual coordination geometries of silver(I) 4,5-diazafluoren-9-one complexes

Cu(II), Ni(II), and Hg(II) thiocyanate complexes incorporating 4,5-diazafluoren-9-one: synthesis, spectroscopic characterization, X-ray studies, and magnetic properties

“…In complex 1, 4,5-diazafluoren-9-one coordinates to the central ion in an asymmetrical mode forming one normal Cu-N bond of 2.0510(19) Å length and one semicoordinate bond of 2.637(2) Å length, whereas the nickel-nitrogen (dafone) bond lengths are almost equivalent. Both symmetrically and asymmetrically chelating modes of dafone have been reported previously [11][12][13][14][15][16]27]. The Cu-N and Ni-N bond lengths in 1 and 2 are in accordance with those found in the related complexes.…”

“…The two coordinating nitrogens in dafone have a larger bite distance (2.99 Å ) compared to phen (2.65 Å ) resulting in unusual coordination modes and differences in electrochemical and biological properties [11][12][13][14][15][16].…”

Synthesis, crystal structure and cytotoxicity studies of cis-dichloro(4,5-diazafluoren-9-one)platinum(II)

“…It is known that dafone, due to its long chelate bite forms one short and one long bond with transition ions like Cu 2+ , Zn 2+ and Ag + [22][23][24][25][26][27][28][29][30].…”

First Evidence for the Existence of Hexafluoroantimonic(V) Acid

“…Considering all these parameters and the values of the Cl-Ag-Cl angle of 73.21(10)a nd of the Br1-Ag-Cla ngle of 98.00(6)8,t he silver coordination polyhedron in 1 can be considered as ah ighly distorted tetrahedron, whichi sq uite unusual. [15] As shown by its X-ray analysis, complex 2 can actually be described as the indium hydroxide [{IPr·In(OH) 0. 5 Figure 3).…”