Refinement of the crystal structure of cw-bis(2,2’-bipyridyl)- dichlorocobalt(III) chloride dihydrate, [C20H16N4CoCl2]Cl · 2H2O

Crystal Structure of <i>cis</i>-Bis(2,2′-bipyridyl)dichlorocobalt(III) Nitrate Methanol Solvate

“…6 The structure parameters of a cation part were similar to those of the previously reported crystal structure, [CoCl2(bpy)2]Cl•2H2O. 7 Das and co-workers focused on 1-D water-anion chains, which were ladder-shape hydrogen bonding networks between counter ions, NO3 -, and square units of four lattice water molecules connected by hydrogen bonding interactions, in the crystal, because polypyridyl moieties that were present in biological molecules might stabilize various water topologies in the environment, resembling those in living system. They concluded that the water-nitrate cluster might bring to light, yet different novel, mode of cooperative association of water molecules with nitrate anions.…”

“…It brought about an efficient cleavage of double-stranded DNA without the requirement of an external agent in a concentration-dependent manner. 6 Similar 1-D water-anion chains were also observed in the Cl-salt, 7 though it is not described in this report. These crystal structures of cis- 6,7 indicated that a complex cation, cis-[CoCl2(bpy)2] + , would have two kinds of 1-D chains in the crystal without depending on a kind of counter ion.…”

Bis(2,2′-bipyridyl-κ2 N,N′)dichloridorhodium(III) perchlorate

“…The Rh-N axial bond distance (2.038 (3) Å) is slightly longer than Rh-N equatorial bonds (average 2.026 (5) Å). Its may be well compared with the negligible difference between equatorial and axial M-N bonds distances seen in the analogous complexes of platinum metal group (Lahuerta et al, 1991;Kim et al, 2009;Helberg et al, 1996;Prajapati et al, 2008;Eggleston et al, 1985), but greater distortion observed in majority of transition metal complexes (Strenger et al, 2000;Fontaine, 2001;Kramer & Straehle, 1986;Sofetis et al, 2006;Figgis et al, 1985;Choudhury et al, 2006;Gao & Ng, 2010). The Rh-Cl bond distances in (I) are 2.3291 (9) (equatorial) and 2.3344 (9) Å (axial …”

“…Data collection: CrysAlis PRO (Agilent, 2011); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SIR92 (Altomare et al, 1994); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al, 2006); software used to prepare material for publication: WinGX (Farrugia, 1999) In recent years, noble metal complexes of pyridyl ligands have received much attention because of their rich electrochemical (Rasmussen et al, 1990, photophysical (Forster & Rund, 2003 and photochemical (Arachchige et al, 2008) properties, and their potential applications in catalysis (Mbaye et al, 2003), biochemistry (Tan et al, 2005;Chifotides et al, 2004) and anticancer activity (Karidi et al, 2005). Bipyridine (bipy) is one of the most commonly used bidentate ligand of this type in the formation of wide variety of transition metal complexes with a general formula of Mn, Fe) in which X is an coordinated anionic ligand such as CN, SCN and chloride (De Munno et al, 1993;Eggleston et al, 1985;Kramer & Straehle, 1986;Al-Noaimi and Haddad, 2007;Fontaine, 2001;Choudhury et al, 2006;Gao & Ng, 2010) (Figgis et al, 1985;Sofetis et al, 2006;Andansen & Josephsen, 1971;Strenger et al, 2000;Kim et al, 2009;Prajapati et al, 2008;Helberg et al, 1996). The complex [RhCl 2 (bipy) 2 ]Cl.2H 2 O has also been obtained and crystallographycaly determined by Lahuerta et al, 1991.…”

“…For their photochemical and photophysical properties, see : Forster & Rund (2003); Arachchige et al (2008) and for their electrochemical properties, see: Rasmussen et al (1990). For related structures, see: Al-Noaimi & Haddad (2007); Andansen & Josephsen (1971); Choudhury et al (2006);De Munno et al (1993); Figgis et al (1985); Fontaine (2001); Gao & Ng (2010); Kramer & Straehle (1986); Sofetis et al (2006); Strenger et al (2000). For similar structures with platinum group metals, see: Lahuerta et al (1991); Kim et al (2009);Helberg et al (1996); Prajapati et al (2008); Eggleston et al (1985).…”