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The title compound, [Bi(C8H18PS2)3], contains a BiIII cation surrounded by three bis­(2-methyl­prop­yl)dithio­phosphinate anions, leading to a distorted octa­hedral coordination for the heavy metal. The Bi—S and S—P bond lengths are in the ranges 2.7694 (18)–2.8391 (17) and 2.019 (2)–2.035 (2) Å, respectively. The crystal structure is consolidated by C—H...S hydrogen bonds. Intra­molecular C—H...π inter­actions also play a role in stabilizing the mol­ecules.

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The mol­ecule of title compound, C13H11N5, is essentially planar (r.m.s. deviation = 0.0440 Å) and an intra­molecular C—H...N hydrogen bond generates an S(6) motif. In the crystal, mol­ecules are connected into chains by inter­molecular N—H...N and C—H...N hydrogen bonds. In addition, π–π stacking inter­actions are observed between the pyrazole and pyridazine rings [inter­planar distance = 3.6859 (10) Å].

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In the title compound, C16H14N4O2S, intra­molecular N—H...N hydrogen bonding forms an S(5) ring, whereas N—H...O and C—H...S inter­actions complete S(6) ring motifs. In the crystal, mol­ecules form inversion dimers due to N—H...O inter­actions. The dimers are inter­linked through N—H...S hydrogen bonds and π–π inter­actions occur with a centroid–centroid distance of 3.8422 (11) Å between the meth­oxy-containing benzene ring and the five-membered heterocyclic ring.

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In the title compound, C15H11N5O3S, intra­molecular N—H...N hydrogen bonding forms an S(5) ring motif, whereas N—H...O and C—H...S inter­actions type complete S(6) ring motifs. The 2-oxoindoline and 3-methoxy­phenyl rings are almost planar, with r.m.s. deviations of 0.0178 and 0.0149 Å, respectively, and form a dihedral angle of 33.59 (3)°. In the crystal, mol­ecules are inter­linked through the nitro groups in an end-to-end fashion via N—H...O and C—H...O inter­actions.

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The asymmetric unit of title compound, C18H16O2, contains two mol­ecules with slightly different conformations. In the first mol­ecule, the two phenyl rings make dihedral angles of 84.98 (11)° and the five-membered ring makes dihedral angles of 84.80 (12) and 73.00 (12)° with the phenyl rings; the corresponding angles for the second mol­ecule are 86.74 (11), 81.20 (13) and 71.36 (12)°. O—H...O hydrogen bonds between the hy­droxy and carbonyl groups are a feature of the crystal packing, which results in chains extending parallel to [100]. Weak C—H...O and C—H...π inter­actions are also observed.

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The title compound, C8H8N2O4, is almost planar (r.m.s. deviation = 0.037 Å) and an intra­molecular N—H...O hydrogen bond generates an S(6) ring. In the crystal, inversion dimers linked by pairs of O—H...O hydrogen bonds generate R22(8) loops. Inter­molecular N—H...O hydrogen bonds (involving the same H atom that forms the intra­molecular hydrogen bond) link the dimers into infinite sheets lying parallel to (102).
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