Sabine Foro

Mangalore university, Mangalore, State of Karnataka, India

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Publications (455)153.69 Total impact

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    ABSTRACT: Eight new N-Hoveyda-type complexes were synthesized in yields of 67-92 % through reaction of [RuCl2 (NHC)(Ind)(py)] (NHC=1,3-bis(2,4,6-trimethylphenylimidazolin)-2-ylidene (SIMes) or 1,3-bis(2,6-diisopropylphenylimidazolin)-2-ylidene (SIPr), Ind=3-phenylindenylid-1-ene, py=pyridine) with various 1- or 1,2-substituted ferrocene compounds with vinyl and amine or imine substituents. The redox potentials of the respective complexes were determined; in all complexes an iron-centered oxidation reaction occurs at potentials close to E=+0.5 V. The crystal structures of the reduced and of the respective oxidized Hoveyda-type complexes were determined and show that the oxidation of the ferrocene unit has little effect on the ruthenium environment. Two of the eight new complexes were found to be switchable catalysts, in that the reduced form is inactive in the ring-opening metathesis polymerization of cis-cyclooctene (COE), whereas the oxidized complexes produce polyCOE. The other complexes are not switchable catalysts and are either inactive or active in both reduced and oxidized states.
    Chemistry 06/2013; · 5.93 Impact Factor
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    ABSTRACT: In the title compound, CHClNOS, the dihedral angle between the benzene rings is 31.4 (2)°. In the crystal, N-H⋯O hydrogen bonds link the mol-ecules into (4) chains running along the axis direction.
    Acta Crystallographica Section E Structure Reports Online 01/2013; 69(Pt 1):o7. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, CHClNOS, the N-C bond in the C-SO-NH-C segment has torsions with respect to the S=O bonds. Further, the N-H bond is to the -nitro group in the sulfonyl benzene ring and also to both the - and -Cl atoms in the aniline ring. The mol-ecule is twisted at the S-N bond with a torsion angle of 61.15 (18)°. The dihedral angle between the planes of the benzene rings is 68.00 (6)°. The amide H atom exhibits an intra-molecular bifurcated N-H⋯(O,O) hydrogen bond. In the crystal, pairs of N-H⋯O(S) hydrogen bonds link the mol-ecules into inversion dimers with (8) motifs.
    Acta Crystallographica Section E Structure Reports Online 01/2013; 69(Pt 1):o76. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, [K(C7H6Cl2NO2S)(H2O)] n , the K(+) cation is hepta-coordinated by two water O atoms, a sulfonyl O atom from each of four different N,4-dichloro-2-methyl-benzene-sulfonamidate anions and a Cl atom of one of the anions. Further, K-O-K bridges form extensive polymeric chains along the b axis. In the crystal structure, the anions are linked into layers parallel to (100) by O-H⋯Cl and O-H⋯N hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 01/2013; 69(Pt 8):m426. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, K(+)·C7H6BrClNO2S(-)·H2O, the K(+) cation is hepta-coordinated by two water O atoms, four sulfonyl O atoms of four different N-bromo-4-chloro-2-methyl-benzene-sulfonamidate anions, and one Br atom of one of the anions. The S-N distance of 1.584 (3) Å is consistent with an S=N double bond. In the crystal, the anions are linked into layers by O-H⋯Br and O-H⋯N hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 01/2013; 69(Pt 7):m370. · 0.35 Impact Factor
  • Chem. Eur. J. 01/2013;
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    ABSTRACT: In the crystal structure of the title compound, CHNOS, the N-H bond is to the -nitro group in the sulfonyl benzene ring and to the - and to the -methyl groups in the aniline ring. The mol-ecule is twisted at the S-N bond with a torsion angle of 71.41 (18)°. The dihedral angle between the planes of the benzene rings is 51.07 (8)°. In the crystal, pairs of N-H⋯O hydrogen bonds link the mol-ecules into inversion dimers.
    Acta Crystallographica Section E Structure Reports Online 12/2012; 68(Pt 12):o3426. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, CHClNOS, the dihedral angle between the benzene rings is 70.60 (11)°. An intra-molecular N-H⋯Cl contact occurs. In the crystal, mol-ecules form inversion dimers pairs of N-H⋯O hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 12/2012; 68(Pt 12):o3497. · 0.35 Impact Factor
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    ABSTRACT: There are two independent mol-ecules in the asymmetric unit of the title compound, CHClNOS, in which the dihedral angles between the planes of the benzene rings are 46.90 (14) and 44.50 (14)°. In the crystal, N-H⋯O hydrogen bonds link the mol-ecules into zigzag chains parallel to the axis.
    Acta Crystallographica Section E Structure Reports Online 12/2012; 68(Pt 12):o3424. · 0.35 Impact Factor
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    ABSTRACT: There are two independent mol-ecules in the asymmetric unit of the title compound, CHNOS, in which the dihedral angles between the benzene rings are 56.22 (15) and 58.16 (14)°. In the crystal, N-H⋯O hydrogen bonds link the mol-ecules into zigzag chains running along the axis direction.
    Acta Crystallographica Section E Structure Reports Online 12/2012; 68(Pt 12):o3425. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, CHClNOS, the C-S-N-C torsion angle is 49.34 (18)° and the dihedral angle between the benzene rings is 71.92 (10)°. The amide H atom exhibits bifurcated hydrogen bonding. The N-H bond is to the -nitro group enabling the formation of an (7) loop. In the crystal, pairs of N-H⋯O(S) hydrogen bonds link the mol-ecules into inversion dimers (8) rings.
    Acta Crystallographica Section E Structure Reports Online 12/2012; 68(Pt 12):o3482. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, K(+)·C(6)H(4)BrN(2)O(4)S(-)·H(2)O, the K(+) ion is hepta-coordinated by two O atoms from two different water mol-ecules, three sulfonyl O atoms from three N-bromo-2-nitro-benzene-sulfonamidate anions and two nitro O atoms from two N-bromo-2-nitro-benzene-sulfonamidate anions. The S-N distance of 1.576 (4) Å is consistent with an S=N double bond. The crystal structure is stabilized by inter-molecular O-H⋯N and O-H⋯Br hydrogen bonds which link the molecules into polymeric layers running parallel to the bc plane.
    Acta Crystallographica Section E Structure Reports Online 11/2012; 68(Pt 11):m1358. · 0.35 Impact Factor
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    ABSTRACT: The asymmetric unit of the title salt, K(+)·C(6)H(3)BrCl(2)NO(2)S(-)·1.5H(2)O, contains one K(+) cation, one N-bromo-2,4-dichlorobenzenesulfonamidate anion, one water molecule in general position and one water molecule located on a twofold rotation axis. The K(+) cation is hepta-coordinated by three water O atoms and four sulfonyl O atoms from three symmetry-related N-bromo-2,4-dichloro-benzene-sulfonamide anions. The S=N distance of 1.575 (3) Å is consistent with that of a double bond. In the crystal, the anions are linked by O-H⋯Br and O-H⋯N hydrogen bonds into layers parallel to the ac plane.
    Acta Crystallographica Section E Structure Reports Online 11/2012; 68(Pt 11):m1368. · 0.35 Impact Factor
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    ABSTRACT: There are two independent mol-ecules in the asymmetric unit of the title compound, C(14)H(14)N(2)O(4)S. The N-H bonds are syn to the ortho-nitro groups in the sulfonyl benzene rings and anti to the methyl groups in the aniline benzene rings. The mol-ecules are twisted at the S-N bonds with torsion angles of -60.4 (3) and 58.8 (3)° in the two mol-ecules. The dihedral angles between the planes of the sulfonyl and the anilino benzene rings are 53.67 (8) and 56.99 (9)°. The amide H atoms of both mol-ecules are involved in an intra-molecular hydrogen bond, generating an S(7) motif. In the crystal, pairs of N-H⋯O(S) hydrogen bonds link like mol-ecules into inversion dimers.
    Acta Crystallographica Section E Structure Reports Online 11/2012; 68(Pt 11):o3188. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, C(12)H(10)N(2)O(4)S, the dihedral angle between the aromatic rings is 36.19 (18)°. In the crystal, N-H⋯O hydrogen bonds link the mol-ecules into C(4) chains running along the a axis.
    Acta Crystallographica Section E Structure Reports Online 10/2012; 68(Pt 10):o2872. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, C(13)H(12)N(2)O(4)S, the dihedral angle between the planes of the rings is 51.11 (10)°. In the crystal, mol-ecules are linked into inversion dimers through pairs of N-H⋯O(S) hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 09/2012; 68(Pt 9):o2766. · 0.35 Impact Factor
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    ABSTRACT: The asymmetric unit of the title compound, C14H14N2O4S, consists of two crystallographically independent mol­ecules. The mol­ecules are twisted at the S—N bonds with C—S—N—C torsion angles of 44.2 (3) and −49.3 (3)°. The dihedral angles between the benzene rings in the two mol­ecules are 71.53 (7) and 72.11 (7)°. The amide H atoms exhibit bifurcated intra- and inter­molecular hydrogen bonds; the intra­molecular N—H⋯O(N) hydrogen bonds generate S(7) motifs. In the crystal, the independent mol­ecules are separately connected through the inter­molecular N—H⋯O(S) hydrogen bonds, generating a C(4) motif and a helical chain along the b axis for one mol­ecule and an R22(8) motif and an inversion dimer for the other. The crystal studied was a pseudo-merohedral twin with twin law (-100/0-10/001), the refined ratio of the twin domains being 0.7876 (12):0.2124 (12).
    Acta Crystallographica Section E Structure Reports Online 09/2012; 68(10). · 0.35 Impact Factor
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    ABSTRACT: In the crystal of the title compound, C(13)H(12)N(2)O(4)S, the conformation of the N-H bond in the -SO(2)-NH- segment is syn to the ortho-nitro group in the sulfonyl benzene ring. The mol-ecule is twisted at the S-N bond with a torsion angle of 76.55 (18)°. The dihedral angle between the planes of the rings is 72.64 (8)°. In the crystal, mol-ecules are linked by pairs of N-H⋯O(S) hydrogen bonds to form inversion dimers.
    Acta Crystallographica Section E Structure Reports Online 09/2012; 68(Pt 9):o2745. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, C(13)H(12)N(2)O(4)S, the dihedral angle between the benzene rings is 53.44 (14)°. The amide H atom exhibits bifurcated hydrogen bonding: an intra-molecular N-H⋯O hydrogen bond generates an S(7) motif while in the crystal, N-H⋯O(S) hydrogen bonds link the mol-ecules into zigzag C(4) chains along the c axis.
    Acta Crystallographica Section E Structure Reports Online 09/2012; 68(Pt 9):o2649. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, C(13)H(12)N(2)O(4)S, the dihedral angle between the benzene rings is 73.64 (7)°. The amide H atom exhibits bifurcated hydrogen bonding: an intra-molecular N-H⋯O hydrogen bond generates an S(7) motif while in the crystal, N-H⋯O(S) hydrogen bonds link the mol-ecules into zigzag C(4) chains running along the b axis.
    Acta Crystallographica Section E Structure Reports Online 09/2012; 68(Pt 9):o2627. · 0.35 Impact Factor

Publication Stats

803 Citations
153.69 Total Impact Points

Institutions

  • 2012–2013
    • Mangalore university
      • Department of Chemistry
      Mangalore, State of Karnataka, India
  • 2006–2011
    • Technical University Darmstadt
      • • Institute of Materials Science
      • • Clemens Schöpf Institut für Organische Chemie und Biochemie
      Darmstadt, Hesse, Germany