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ISSN: 2414-3146

June 2019 issue

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Cover illustration: 6-Methyluracil exists in two crystalline phases: form (I), monoclinic, space group P21/c and form (II), monoclinic, space group C2/c. The structure of polymorph (II) has been redetermined, providing a significant increase in the precision of the derived geometric parameters. The radical differences observed between the crystal packing of the two polymorphs may be responsible in form (II) for an increase in the contribution of the polar canonical forms C—(O)=N—H+ relative to the neutral canonical form C(=O)—N—H induced by hydrogen-bonding inter­actions. See: Gustavo Portalone [IUCrData (2019). 4, x190861].

metal-organic compounds

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In the crystal structure of the title compound, [Sn(C42H26N6)(C7H5O2)2], the SnIV ion is octa­hedrally coordinated with an N4O2 set. Four N atoms of the porphyrin ring form the equatorial plane while the axial positions are occupied by O atoms from benzoate anions. The crystal packing is stabilized by weak inter­molecular non-classical hydrogen-bonding inter­actions.

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The title compound, [Co(NCS)2(C15H22N2O2)2], crystallizes with two half mol­ecules in the asymmetric unit, which are completed by crystallographic inversion symmetry.

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The Ba2+ ions are sandwiched between the 15-crown-5 rings and Zn2+ ions are surrounded by four N atoms from the thio­cyanate ligands in a distorted tetra­hedral geometry.

organic compounds

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In the title compound, the dihedral angle between the planes of the two aryl rings is 44.5 (9)°. The mol­ecular packing is stabilized by weak C—H⋯π inter­actions.

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In the crystal of the title co-crystal, the acid and base mol­ecules are linked via N—H⋯O, O—H⋯N, O—H⋯O and C—H⋯O hydrogen bonds, forming (001) sheets.

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The structure of 6-methyl­uracil, C5H6N2O2, monoclinic, space group C2/c, polymorph (II), has been redetermined to improved precision.
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