Lattice Forces in Heavy Metal Picrates: Structural Characterization of Lead and Mercury Species

Abstract

Structure determinations for the dimethylsulfoxide (dmso) solvate of lead(II) picrate (picrate 5 pic 5 2,4,6-trinitrophenoxide), formally a centrosymmetric dimer, [Pb 2 (dmso) 4 (pic) 4 ], and for unsolvated mercury(I) picrate, a polymer of conventional mercurous dimers, [Hg 2 (-pic) 2 ] n , show that, despite considerable differences in the form of the metal unit, there are remarkable similarities in the mode of coordination of the bridging picrate ligands. In both lattices, parallel arrays of picrate rings can be discerned but appear to be associated with short N· · ·O, O· · ·O or O· · ·C contacts rather than C· · ·C. In the Pb compound, there is also evidence of intramolecular contacts to dmso-S.

Stereochemistry of lead(II) complexes with oxygen donor ligands

“…The structure of dmso solvate Pb(pic) 2 ·2dmso (Hpic = picric acid, 54) is built from centrosymmetrical dimers [Pb 2 (pic) 4 (dmso) 4 ] [102]. Both Pb atoms in the dimer are bonded by phenoxide groups of two picrate ligands with formation of a planar, dimeric Pb 2 O 2 core.…”

Bis(N,N-dimethylformamide-κO)bis(2,4,6-trinitrophenolato-κ2O1,O2)copper(II)

“…Picrate anion with extraordinary varieties in the binding of complexes, has great potential in building coordination networks (Liu et al, 2008). They can act as the bridging mono- (Arnaud-Neu et al, 2005;Wang et al, 2003), di- (Marchand et al, 2003;Song et al, 2007), tri- (Harrowfield et al, 1995;Dong et al, 1998;Dong et al, 2007a), tetra- (Venkatasubramanian et al, 1985) or penta- (Dong et al, 2007b;Harrowfield et al, 1998) dentate ligands via the phenolic oxygen, ortho-nitro oxygen and para-nitro oxygen atoms to build coordination networks as well as interlink the one-dimensional or two-dimensional molecules into frameworks via the hydrogen bonds (Muthamizhchelvan et al, 2005) or π-π stacking interactions (Talanova et al, 1999). Here, in continuation of our previous studies on synthesis and structural characterization of transition metal complexes with salen-type bisoxime chelating ligands, a single-crystal of unexpected complex, bis(N,N-dimethylformamide-κ O)bis(2,4,6-trinitrophenolatoκ 2 O,O′)copper(II), was obtained and structurally characterized by X-ray crystallography.…”

“…For background to 2,4,6-trinitrophenoxides, see: Arnaud-Neu et al (2005); Dong et al (1998Dong et al ( , 2007a; Harrowfield et al (1995Harrowfield et al ( , 1998; Liu et al (2008); Marchand et al (2003); Muthamizhchelvan et al (2005); Song et al (2007); Talanova et al (1999); Venkatasubramanian et al (1985); Wang et al (2003).…”

Synthesis and structure of a new ternary monocopper(II) complex containing mixed ligands of 2,2′‐diamino‐4,4′‐bithiazole and picrate:in vitroanticancer activity, molecular docking and reactivity towards DNA

“…Hence, many metal complexes with pic as ligands have been reported. [16][17][18] However, to the best of our knowledge, so far, a ternary copper(II) complex containing mixed ligands of pic and dabt has not been reported. Thus, it is of considerable interest to synthesize and study the DNA-binding properties and anticancer activities of this kind of ternary copper (II) complex in order to gain insight into the structure-activity relationship.…”