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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 the title polymeric complex, {[Sn2=(C6H5)6(C3H2O4)(H2O)]·C3H6O}n, comprises of two Sn cations, one malonate anion and a non-coordinating acetone solvent mol­ecule. Both crystallographically independent Sn cations are five-coordinated by two O and three C atoms in a distorted trigonal-bipyrimidal geometry. One of the Sn cations is bridged by the malonate units, affording polymeric chains which run along [001]. Weak intra­molecular C—H...π inter­actions stabilize the mol­ecular structure. In the crystal structure, adjacent chains are inter­connected by inter­molecular O—H...O and C—H...O hydrogen bonds into a three-dimensional supra­molecular structure. A weak inter­molecular C—H...π inter­action is also observed.

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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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The title compound, C13H10BrNO2, crystallizes in a zwitterionic form. The zwitterion exists in a trans configuration about the C=N bond and is almost planar, the dihedral angle between the two benzene rings being 2.29 (9)°. An intra­molecular N—H...O hydrogen bond formed between the iminium NH+ and the phenolate O atoms generates an S(6) ring motif. In the crystal, the zwitterions are linked through O—H...O hydrogen bonds into chains along [101] and these chains are further connected through C—H...Br inter­actions into a two-dimensional network perpendicular to (101). C...C [3.572 (3)–3.592 (3) Å] and C...Br [3.5633 (19)–3.7339 (18) Å] short contacts are observed. The crystal studied was a twin with twin law \overline{1}00, 0\overline{1}0, 001 with a domain ratio of 0.09919 (2):0.90081 (2).
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