Synthesis and characterization of the facial and meridional isomers of Co(5-MeOqo)3 (5-MeOqoH = 5-Methoxy-1,2-benzoquinone-2-oxime) and crystal structural of fac-Co(5-MeOqo)3

Hexaaquabis[3,5-bis(hydroxyimino)-1-methyl-2,4,6-trioxocyclohexanido-κ2N3,O4]barium tetrahydrate

“…As a result, a three-dimensional network is formed. The described structure is in accordance with the other known structures of complexes of 1,2-benzo(naphto) quinone -1-oximes with the alkaline (Charalambous et al, 1993(Charalambous et al, ,1995Adatia et al, 1996) and transition metals (Basu and Chakravorty, 1992;Charalambous et al, 1996;McPartlin, 1973) where the formation of monomeric complexes with the bidentate chelating coordination mode of the ligands was observed. The only one difference is in the nature of the hydroxyimino group which is not ionized in the structure reported here.…”

“…For the synthesis and crystal structure of sodium 3,5-bis(hydroxyimino)-1-methyl-2,4,6-trioxocyclohexanide, see: Kovalchukova et al (2012). For related structures of metal complexes with 1,2-benzo(naphto)quinone-1-oximes, see: Chakravorty (1974); Charalambous et al (1993Charalambous et al ( , 1995Charalambous et al ( , 1996; Adatia et al (1996); Basu & Chakravorty (1992); McPartlin (1973); Djinovic et al (1992); Liu et al (2010). For applications of related complexes as catalysts, see: Gharah et al (2009).…”

“…Data collection: CAD-4-PC (Enraf-Nonius, 1993); cell refinement: CAD-4-PC; data reduction: CAD-4-PC; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: CIFTAB97 (Sheldrick, 2008) (Chakravorty, 1974;Charalambous et al, 1996;Djinovic et al, 1992;Liu et al, 2010). Increasing attention is also being devoted to these complexes in recent years because of their applications in organic synthesis (Gharah et al, 2009).…”

Hexaaquabis[3,5-bis(hydroxyimino)-1-methyl-2,4,6-trioxocyclohexanido-κ2N3,O4]barium tetrahydrate

“…As a result, a three-dimensional network is formed. The described structure is in accordance with the other known structures of complexes of 1,2-benzo(naphto) quinone -1-oximes with the alkaline (Charalambous et al, 1993(Charalambous et al, ,1995Adatia et al, 1996) and transition metals (Basu and Chakravorty, 1992;Charalambous et al, 1996;McPartlin, 1973) where the formation of monomeric complexes with the bidentate chelating coordination mode of the ligands was observed. The only one difference is in the nature of the hydroxyimino group which is not ionized in the structure reported here.…”

“…For the synthesis and crystal structure of sodium 3,5-bis(hydroxyimino)-1-methyl-2,4,6-trioxocyclohexanide, see: Kovalchukova et al (2012). For related structures of metal complexes with 1,2-benzo(naphto)quinone-1-oximes, see: Chakravorty (1974); Charalambous et al (1993Charalambous et al ( , 1995Charalambous et al ( , 1996; Adatia et al (1996); Basu & Chakravorty (1992); McPartlin (1973); Djinovic et al (1992); Liu et al (2010). For applications of related complexes as catalysts, see: Gharah et al (2009).…”

“…Data collection: CAD-4-PC (Enraf-Nonius, 1993); cell refinement: CAD-4-PC; data reduction: CAD-4-PC; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: CIFTAB97 (Sheldrick, 2008) (Chakravorty, 1974;Charalambous et al, 1996;Djinovic et al, 1992;Liu et al, 2010). Increasing attention is also being devoted to these complexes in recent years because of their applications in organic synthesis (Gharah et al, 2009).…”

Novel Products of Nitrosation of a Series of Trihydroxybenzene Derivatives and Their Complexation with Cu(II), Cd(II) and Fe(III): Synthesis, Characterization, and Theoretical Modeling

“…[19] In our case, with an intensive nitrosation reaction proceeding about 1-2 hours, NaH 2 L 1 was precipitated, but if keep stirring vigorously more than 3 hours, a homogeneous red solution is formed and cannot separated the precipitation. The results of elemental analysis, 1 H, 13 C NMR, and IR spectra of the obtained products are presented in the supplementary part of the paper.…”

5-Ethoxy-1,2-benzoquinone 2-Oxime

“…1) is clearly quinoidal (I) and not phenolic (II), as shown by both the alternation of long and short bonds within the six-membered ring and the position (experimental) of the acidic H atom. If this compound is compared to the 5-methoxy-1,2-benzoquinone 2-oximato ligand in the cobalt(Ill) complex (Charalambous, Raghvani, Carugo & Bisi Castellani, 1996), it appears that the neutral uncomplexed ligand has a stronger quinoidal character than the deprotonated complexed one. Such a feature is also common to unsubstituted 1,2-benzoquinone 2-oximes and has been explained in terms of charge delocalization within the chelate ring (Carugo, Djinovir, Rizzi & Bisi Castellani, 1991).…”

Hexaaquabis[3,5-bis(hydroxyimino)-1-methyl-2,4,6-trioxocyclohexanido-κ2N3,O4]barium tetrahydrate

“…As a result, a three-dimensional network is formed. The described structure is in accordance with the other known structures of complexes of 1,2-benzo(naphto) quinone -1-oximes with the alkaline (Charalambous et al, 1993(Charalambous et al, ,1995Adatia et al, 1996) and transition metals (Basu and Chakravorty, 1992;Charalambous et al, 1996;McPartlin, 1973) where the formation of monomeric complexes with the bidentate chelating coordination mode of the ligands was observed. The only one difference is in the nature of the hydroxyimino group which is not ionized in the structure reported here.…”

“…For the synthesis and crystal structure of sodium 3,5-bis(hydroxyimino)-1-methyl-2,4,6-trioxocyclohexanide, see: Kovalchukova et al (2012). For related structures of metal complexes with 1,2-benzo(naphto)quinone-1-oximes, see: Chakravorty (1974); Charalambous et al (1993Charalambous et al ( , 1995Charalambous et al ( , 1996; Adatia et al (1996); Basu & Chakravorty (1992); McPartlin (1973); Djinovic et al (1992); Liu et al (2010). For applications of related complexes as catalysts, see: Gharah et al (2009).…”

“…Data collection: CAD-4-PC (Enraf-Nonius, 1993); cell refinement: CAD-4-PC; data reduction: CAD-4-PC; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: CIFTAB97 (Sheldrick, 2008) (Chakravorty, 1974;Charalambous et al, 1996;Djinovic et al, 1992;Liu et al, 2010). Increasing attention is also being devoted to these complexes in recent years because of their applications in organic synthesis (Gharah et al, 2009).…”

Novel Products of Nitrosation of a Series of Trihydroxybenzene Derivatives and Their Complexation with Cu(II), Cd(II) and Fe(III): Synthesis, Characterization, and Theoretical Modeling

“…[19] In our case, with an intensive nitrosation reaction proceeding about 1-2 hours, NaH 2 L 1 was precipitated, but if keep stirring vigorously more than 3 hours, a homogeneous red solution is formed and cannot separated the precipitation. The results of elemental analysis, 1 H, 13 C NMR, and IR spectra of the obtained products are presented in the supplementary part of the paper.…”

5-Ethoxy-1,2-benzoquinone 2-Oxime

“…1) is clearly quinoidal (I) and not phenolic (II), as shown by both the alternation of long and short bonds within the six-membered ring and the position (experimental) of the acidic H atom. If this compound is compared to the 5-methoxy-1,2-benzoquinone 2-oximato ligand in the cobalt(Ill) complex (Charalambous, Raghvani, Carugo & Bisi Castellani, 1996), it appears that the neutral uncomplexed ligand has a stronger quinoidal character than the deprotonated complexed one. Such a feature is also common to unsubstituted 1,2-benzoquinone 2-oximes and has been explained in terms of charge delocalization within the chelate ring (Carugo, Djinovir, Rizzi & Bisi Castellani, 1991).…”

Hexaaquabis[3,5-bis(hydroxyimino)-1-methyl-2,4,6-trioxocyclohexanido-κ2N3,O4]barium tetrahydrate

“…As a result, a three-dimensional network is formed. The described structure is in accordance with the other known structures of complexes of 1,2-benzo(naphto) quinone -1-oximes with the alkaline (Charalambous et al, 1993(Charalambous et al, ,1995Adatia et al, 1996) and transition metals (Basu and Chakravorty, 1992;Charalambous et al, 1996;McPartlin, 1973) where the formation of monomeric complexes with the bidentate chelating coordination mode of the ligands was observed. The only one difference is in the nature of the hydroxyimino group which is not ionized in the structure reported here.…”

“…For the synthesis and crystal structure of sodium 3,5-bis(hydroxyimino)-1-methyl-2,4,6-trioxocyclohexanide, see: Kovalchukova et al (2012). For related structures of metal complexes with 1,2-benzo(naphto)quinone-1-oximes, see: Chakravorty (1974); Charalambous et al (1993Charalambous et al ( , 1995Charalambous et al ( , 1996; Adatia et al (1996); Basu & Chakravorty (1992); McPartlin (1973); Djinovic et al (1992); Liu et al (2010). For applications of related complexes as catalysts, see: Gharah et al (2009).…”

“…Data collection: CAD-4-PC (Enraf-Nonius, 1993); cell refinement: CAD-4-PC; data reduction: CAD-4-PC; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: CIFTAB97 (Sheldrick, 2008) (Chakravorty, 1974;Charalambous et al, 1996;Djinovic et al, 1992;Liu et al, 2010). Increasing attention is also being devoted to these complexes in recent years because of their applications in organic synthesis (Gharah et al, 2009).…”

Novel Products of Nitrosation of a Series of Trihydroxybenzene Derivatives and Their Complexation with Cu(II), Cd(II) and Fe(III): Synthesis, Characterization, and Theoretical Modeling

“…[19] In our case, with an intensive nitrosation reaction proceeding about 1-2 hours, NaH 2 L 1 was precipitated, but if keep stirring vigorously more than 3 hours, a homogeneous red solution is formed and cannot separated the precipitation. The results of elemental analysis, 1 H, 13 C NMR, and IR spectra of the obtained products are presented in the supplementary part of the paper.…”

5-Ethoxy-1,2-benzoquinone 2-Oxime

“…1) is clearly quinoidal (I) and not phenolic (II), as shown by both the alternation of long and short bonds within the six-membered ring and the position (experimental) of the acidic H atom. If this compound is compared to the 5-methoxy-1,2-benzoquinone 2-oximato ligand in the cobalt(Ill) complex (Charalambous, Raghvani, Carugo & Bisi Castellani, 1996), it appears that the neutral uncomplexed ligand has a stronger quinoidal character than the deprotonated complexed one. Such a feature is also common to unsubstituted 1,2-benzoquinone 2-oximes and has been explained in terms of charge delocalization within the chelate ring (Carugo, Djinovir, Rizzi & Bisi Castellani, 1991).…”