No abstract

In the title compound, C24H20BrN3O4S, the central benzene ring makes dihedral angles of 17.13 (13), 39.83 (13) and 58.37 (13)°, respectively, with the pyrazolone ring, the bromo­benzene ring and the terminal phenyl ring. In the crystal structure, the packing is stabilized by a weak non-classical inter­molecular C—H⋯O hydrogen bond which links the mol­ecules into a chain propagating in [100].

Key indicators: single-crystal X-ray study; T = 294 K; mean (C-C) = 0.005 Å; R factor = 0.054; wR factor = 0.157; data-to-parameter ratio = 13.8.In the title compound, C 15 H 13 ClO 3 , the vanillin group makes a dihedral angle of 72.79 (9) with the chlorobenzene ring. The crystal structure is stabilized by weak non-classical intermolecular C-HÁ Á ÁO hydrogen bonds that form centrosymmetric dimers. Related literatureFor general background, see: Allen et al. (1987); Jones et al. (1979); Larson & Pecoraro (1991); Santos et al. (2001). Experimental Crystal data C 15 H 13 ClO 3 M r = 276.70 Monoclinic, P2 1 =c a = 9.054 (3) Å b = 8.535 (2) Å c = 17.828 (5) Å = 90.10 (2) V = 1377.7 (7) Å 3 Z = 4 Mo K radiation = 0.28 mm À1 T = 294 (2) K 0.28 Â 0.22 Â 0.20 mm Data collection Bruker SMART APEX CCD area-detector diffractometer Absorption correction: multi-scan (SADABS; Sheldrick, 1996) T min = 0.912, T max = 0.946 6675 measured reflections 2383 independent reflections 1124 reflections with I > 2(I) R int = 0.048

In the title compound, C25H22N4O4, the central benzene ring, makes dihedral angles of 74.35 (6), 17.01 (8) and 62.19 (7)°, respectively, with the nitro­benzyl ring, the pyrazolone ring and the terminal phenyl ring. Inter­molecular C—H⋯O hydrogen bonds help to consolidate the crystal packing.

In the title compound, C26H23Cl2N3O3, the central vanillin group makes dihedral angles of 51.19 (8), 7.51 (11) and 45.65 (11)° with the dichloro­benzene ring, the pyrazolone ring and the terminal phenyl ring, respectively. Inter­molecular C—H⋯O inter­actions help to consolidate the crystal packing.