Water-Bridged Molecular Adduct of Tetrabromocadmate(II) with Protonated Dafone (4,5-Diazafluoren-9-one), (C11H7N2O)2[CdBr4].2H2O

Abstract

The structure of the title compound, bis(4H+-9 -oxo-4,5-diazafluorenium) tetrabromocadmate(II)-water (1/2), consists of a distorted tetrahedral (CdBr4) 2-anion and HL + cations, where L is the organic ligand dafone (4,5-diazafluoren-9-one). There is no direct bonding between the metal atom and the ligand. The protonation of one of the N atoms in the dafone ring system gives rise to an opening of the C--N----C angle when compared with the corresponding value in the neutral form. The dihedral angles between the mean planes of the pyridine Acta Crystallographica Section C

Synthesis, Structure and Photoluminescence of [N-ethyl-4,4′-bipyridinium][CdBr4] with N-ethyl-4,4′-bipyridinium Generated in situ

“…A search from the Cambridge Crystallographic Data Centre (CCDC) shows that there are dozens of complexes containing isolated [CdBr 4 ] 2dianions. 22,23 However, in these complexes the counterpart cations are various but none of them is the N-ethyl-4,4p-bipyridinium dication. Therefore, complex 1 is the first example of an [CdBr 4 ] 2-containing complex with N-ethyl-4,4p-bipyridinium as a counter ion.…”

9-Oxo-4,5-diazafluoren-4-ium tetrachloridoaurate(III)–4,5-diazafluoren-9-one (1/1)

“…For other 9-oxo-4,5-diazafluoren-4-ium tetrachloridometallates, see: Kulkarni et al (2003); Menon et al (1994); Ravikumar et al (1995); Ravikumar & Lakshmi (1994); Zhang et al (2003). For the synthesis of 4,5-diazafluoren-9-one, see: Henderson et al (1984).…”

9-Oxo-4,5-diazoniafluorene sulfate

“…For related literature, see: Balagopalakrishna et al (1996); Menon et al (1994); Ravikumar et al (1995); Siemeling & Scheppelmann (2004); Zhang et al (2003). Data collection: APEX2 (Bruker, 2006); cell refinement: APEX2; data reduction: SAINT (Bruker, 2006); program(s) used to solve structure: SHELXTL (Bruker, 2006); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: SHELXTL.…”

“…Some monoprotonated forms have been reported (Balagopalakrishna et al, 1996), (Menon et al, 1994), (Ravikumar et al, 1995), (Zhang et al, 2003). The molecule is of interest because the non-protonated form is used to make metal complexes in our laboratory.…”