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The asymmetric unit of the title complex, [Tb2(C7H5O2)6(C12H8N2)2]·2C7H6O2, consists of one-half of the complex mol­ecule, which lies on a crystallographic inversion centre, and one benzoic acid solvent mol­ecule. The two TbIII ions are linked by four bridging benzoate ions, with a Tb...Tb distance of 3.9280 (6) Å. Additionally, each TbIII ion is coordinated by one phenanthroline heterocycle and a bidentate benzoate ion. The irregular nine-coordinated geometry of the TbIII ion is composed of seven O and two N atoms. The mol­ecular structure is stabilized by intra­molecular C—H...O hydrogen bonds. In the crystal structure, mol­ecules are linked into chains along the a axis by inter­molecular C—H...O hydrogen bonds. The crystal structure is further stabilized by inter­molecular C—H...O and C—H...π inter­actions. Weak π–π inter­actions are also observed [centroid–centroid distances = 3.6275 (14)–3.6604 (14) Å].

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The asymmetric unit of the title compound, [Fe(C5H5)(C7H8N3S)], consists of two crystallographically independent mol­ecules, A and B. The cyclo­penta­dienyl (Cp) rings in both mol­ecules adopt an eclipsed conformation and are parallel to each other, forming dihedral angles of 2.5 (3) and 1.1 (3)°, respectively. The mean plane of the semicarbazone group is coplanar with the attached Cp ring in mol­ecule A, whereas it is twisted away in mol­ecule B. In the crystal structure, inter­molecular N—H...S hydrogen bonds link the mol­ecules into two-dimensional planes parallel to the ab plane. The structure is further consolidated by C—H...π inter­actions.

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The asymmetric unit of title compound, [Fe(C5H5)(C9H12N3S)], contains two crystallographically independent mol­ecules, A and B. The two cyclo­penta­dienyl (Cp) rings are parallel to each other in both mol­ecules, forming dihedral angles of 2.3 (3) and 1.0 (3)°, respectively, and adopt an eclipsed conformation. The mean plane of the semicarbazone group is twisted slightly away from the attached Cp ring in both mol­ecules, the dihedral angles between the mean plane and the Cp ring being 15.3 (2) and 10.8 (2)°. The ethyl group in mol­ecule A is coplanar with the mean plane of the semicarbazone group [C—N—C—C torsion angle = −175.2 (4)°], whereas it is nearly perpendicular in mol­ecule B [C—N—C—C torsion angle = 84.8 (6)°]. In the crystal structure, inter­molecular N—H...S hydrogen bonds link the mol­ecules into dimers. These dimers are further linked into chains via inter­molecular C—H...S hydrogen bonds. The crystal studied was a non-merohedral twin with a refined ratio of the twin components of 0.265 (2):0.735 (2).

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In the title compound, [Na(C6H3Cl2O3S)(H2O)]n, the NaI ion is penta­coordinated by three dichloro­benzene­sulfonate anions and two water mol­ecules, forming a distorted trigonal-bipyramidal geometry. The NaI ions are bridged by the sulfonate groups and the water mol­ecules, leading to a polymeric layer structure parallel to the bc plane in which O—H...O hydrogen bonds are observed.

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The title compound, C27H45Cl, is a second monoclinic polymorph which crystallizes in the space group P21 with four crystallographically independent mol­ecules in the asymmetric unit. The structure was previously reported [Bernal et al. (1940). Philos. Trans. R. Soc. London Ser. B, 239, 135–182; Vani & Vijayan (1979). Mol. Cryst. Liq. Cryst. 51, 253–264], also in the space group P21, but with two unique mol­ecules in the asymmetric unit. As in the previously reported structures, rings A and C in the mol­ecule adopt chair conformations with half-chair conformations for rings B and D. The ring junctions BC and CD are trans, whereas the junction AB is quasi-trans. In the crystal structure, mol­ecules are arranged in a head-to-tail fashion along a and are stacked along the b axis.

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The asymmetric unit of the title compound, C30H46O4·0.5CHCl3, consists of one koetjapic acid [systematic name: (3R,4aR,4bS,7S,8S,10bS,12aS)-7-(2-carboxy­ethyl)-3,4b,7,10b,12a-penta­methyl-8-(prop-1-en-2-yl)-1,2,3,4,4a,4b,5,6,7,8,9,10,10b,11,12,12a-hexa­deca­hydro­chrysene-3-carboxylic acid] mol­ecule and one half-mol­ecule of chloro­form solvent, which is disordered about a twofold rotation axis. The symmetry-independent component is further disordered over two sites, with occupancies of 0.30 and 0.20. The koetjapic acid contains a fused four-ring system, A/B/C/D. The A/B, B/C and C/D junctions adopt E/trans/cis configurations, respectively. The conformation of ring A is inter­mediate between envelope and half-chair and ring B adopts an envelope conformation whereas rings C and D adopt chair conformations. A weak intra­molecular C—H...O hydrogen bond is observed. The koetjapic acid mol­ecules are linked into dimers by two pairs of inter­molecular O—H...O hydrogen bonds. The dimers are stacked along the c axis.
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