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October 1998 issue
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Cover illustration: An Adduct Between Tetraammine(1,10-phenanthroline)ruthenium(II) and Dibenzo-42-crown-14, see Yoon et al., pages 1427-1431. The hydrogen bonding of the ammine ligands with the crown O atoms is shown with displacement ellipsoids plotted at the 30% probability level. Non-ammine H atoms have been omitted for clarity.
cif-access (metal-organic compounds)
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The title complex consists of infinite positively charged [Sc2(Gly)6]n (Gly = glycine) chains and ClO4− anions. The Sc3+ ions in the [Sc2(Gly)6]n chains are linked by glycine molecules and are octahedrally coordinated by glycine O atoms.
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This compound belongs to a family of dimeric clusters formed through bonding of electron-rich iron carbonyls to electron-deficient thallium. Pressurization under CO of the thallium-iron carbonyl [Et4N]2[Fe4Tl2(CO)16] yielded crystals of [Et4N]2[Fe6Tl2(CO)24], which crystallizes in the orthorhombic centrosymmetric space group Cmca.
cif-access (organic compounds)
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The crystal structure of 2-pyridinecarboxylic acid was redetermined to confirm the space group C2/c. However, a solid-state high resolution 15N CP-MAS NMR study indicated that neutral molecules and zwitterions are arranged alternately within local non-centrosymmetric domains.
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On short-term heating, highly strained ap-9-(o-tert-butylphenyl)-9-(methylthio)fluorene underwent facile cleavage of the C-S bond. Migration of the methylthio group produced sp-9-(o-tert-butylphenyl)-3-(methylthio)fluorene as the major product. Its structure is much less distorted than that of the ap starting material.
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The title compound crystallizes with two independent molecules per asymmetric unit. The molecules assume slightly different conformations. The crystallographically unique molecules stack in columns along the b axis. Close C-H⋯O contacts are observed between molecules related by a twofold screw axis. The absolute configuration was established by internal comparison with the (R)-(−)-O-methyl mandelic acid moiety.
inorganic compounds
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Disodium zinc diphosphate may be doped with europium(III) to produce a red-emitting material, Na1.94Eu0.02ZnP2O7. Determination of the single-crystal X-ray structures of the doped and undoped forms shows them to be isostructural, with EuIII occupying a site of mm symmetry.
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KAg5S3 contains a combination of linear and trigonal planar coordination of Ag by S atoms, resulting in a channeled framework filled with K+ cations.
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The structure of [Co(NO2)(NH3)5]Cl2 has been refined anisotropically from data collected at 0.24, 0.52, 1.25, 1.91 and 3.38 GPa in a diamond anvil cell. For comparison, the structure of the same crystal in the same diamond anvil cell was also refined at ambient pressure.
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This new ammonium zinc phosphate, which is isostructural with KZn2(PO4)(HPO4), consists of corrugated anionic layers of ZnO4 and PO4 tetrahedra sharing vertices. Trigonally coordinated O atoms are present in these layers.
metal-organic compounds
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organic compounds
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