A Sanidine Feldspar Analogue: KFeGe₃O₈

The crystal structure of the sanidine feldspar analogue potassium iron germanate, quenched from 873 K, has been determined in the C2/m space group using a flux-grown single crystal. A partial ordering of Fe is observed on the two tetrahedral sites, with a preferential occupancy for the T1 site (32%) over the T2 site (18%). This ordering is also reflected by the difference in the size of the tetrahedral sites [mean <T1-O> 1.765 (2) Å versus <T2-O> 1.749 (2) Å].

Redetermination of Bis(1,2-ethanedi­ammonium) Dichloride Tetra­chloromercurate(II)

The structure of bis(1,2-ethanediammonium) dichloride tetrachloromercurate, originally determined at 153 K [Wen et al. (1992). Inorg. Chim. Acta, 193, 77-85], has been redetermined with room-temperature data carefully corrected for absorption effects.

[N,N'-Bis(tri­methylsilyl)-o-phenylenedi­amido](1,4-butanediyl)(phenylimido)tungsten(VI), a Deactivation Product from Olefin Metathesis Polymerization

This compound was isolated as a deactivation product from olefin metathesis polymerization and its crystal structure was determined. The W atom has a square-pyramidal coordination geometry with the phenylimido ligand occupying the apical position. A relatively short W-N(imido) bond, 1.736 (3) Å, is interpreted as arising from the interaction of the lone pair of N(imido) and the W metal center.

Di­methanolbis(N-nitroso-N-phenylhydroxylaminato-O,O')cobalt(II)

This complex is isostructural with the analogous nickel complex but has slightly longer metal-oxygen bonds. The crystal is built up from infinite one-dimensional chains of hydrogen-bonded molecules.

[N,N'-Bis(2-pyridylmethyl)ethylenedi­aminedi­acetato]cobalt(III) Perchlorate Monohydrate

The structure of [Co(C₁₈H₂₀N₄O₄)]ClO₄.H₂O is isomorphous with that of the corresponding tetrafluoroborate monohydrate [Mandel & Douglas (1989). Inorg. Chim. Acta, 155, 55-69]. The cobalt(III) atom has distorted octahedral coordination with trans carboxylato groups.

Tetra­phenylphosphonium Tetra­chloroaluminate

The crystal structure of tetraphenylphosphonium tetrachloroaluminate was determined at 150 K. Bond lengths and angles are normal.

A New Polymorph of Bis(di-n-propyldi­thiocarbamato-S,S')nickel(II)

The structure of bis(di-n-propyldithiocarbamato-S,S^')nickel(II) has been reported previously in the rhombohedral space group R-3. The new triclinic polymorph shows similar structural features with a square-planar environment for the Ni atoms.

(2S,3S,5R)-2-Benzyl-N-(tert-butoxycarbonyl)-3-hy­droxy-5-methylpyrrolidine at 158K

The pyrrolidine ring has an envelope conformation. The crystal packing is stabilized by an intermolecular hydrogen bond.

(2S,3R,5S)-2-Benzyl-N-(tert-butoxycarbonyl)-3-hy­droxy-5-methylpyrrolidine at 158K

The pyrrolidine ring has a conformation intermediate between a twist and an envelope. The crystal packing is stabilized by an intermolecular hydrogen bond.

Disorder in Tris(2-methyl-1,2-propanedi­ammonium) cyclo-Hexaphosphate Trihydrate

3C₄H₁₄N₂²⁺.P₆O₁₈⁶⁻.3H₂O contains tetragonal channels parallel to the a direction of the unit cell built up by four rows of P₆O₁₈ rings and completed by organic groups. The condensed phosphoric groups are centrosymmetric, while the three independent organic cations have no internal symmetry.

Piperazine-1,4-diium Di­hydrogendiphosphate

C₄H₁₂N₂²⁺.H₂P₂O₇²⁻ has a typical layer structure composed of organic and inorganic groups centred on planes parallel to (100). The formula unit consists of one acidic anion and two crystallographically independent organic half cations. The H₂P₂O₇²⁻ anions have no internal symmetry whereas the piperazinium cations are centrosymmetric.

The Layered Perovskite K₂Nd₂Ti₃O₁₀

The preparation of single crystals of the layered perovskite K₂Nd₂Ti₃O₁₀ and the characterization of its structure are described.

Na₃Mn₄Te₂O₁₂

Na₃Mn₄Te₂O₁₂ has a superstructure of the CaFe₂O₄ structure type. A tripling of the b axis arises because of significant differences in the oxidation states of tellurium and manganese within their respective octahedra.

A Neodymium-Substituted Britholite Compound

Ca₉Nd(PO₄)₅(SiO₄)F_1.5O_0.25 belongs to the britholite family and is isostructural with apatite. The neodymium ions are distributed over the two calcium sites but are mainly localized in calcium site II.

A Mixed Zinc–Cobalt Diphosphate, ZnCoP₂O₇

The structure of the mixed zinc cobalt diphosphate ZnCoP₂O₇ presents a low-dimensional system not previously observed in the diphosphates of 3d transition elements.

Pb₅O₄MoO₄

The crystal structure of pentalead molybdenum octaoxide is a 4:3:2 superstructure of tetragonal α-PbO (litharge).

Neutron Powder Diffraction Study on Highly Deuterated Ca(IO₃)₂.D₂O

Neutron powder diffraction studies confirm the results of a previous X-ray single-crystal study of the protonated compound. The water molecules form hydrogen bonds of different strengths. Deviation from a random distribution of the H atoms (H/D enrichment effect) has been established.

(Di­ethylenetri­amine)bis­(iso­thio­cyanato)zinc(II)

[7-Methyl-3,7,11,17-tetra­azabi­cyclo[11.3.1]heptadeca-1(17),13,15-triene-κ⁴N](nitrato-κO)copper(II) Nitrate Hydrate

(Iso­thio­cyanato-κN)(1,4,8,11-tetra­methyl-1,4,8,11-tetra­aza­cyclo­tetra­decane-κ⁴N)copper(II) Perchlorate

Bis[N-(2-bromo-4-methylphenyl)naphthaldiminato]copper(II)

Rerefinement of {1-[(2-Hydroxybenzyl­idene)amino­methyl]naphthalen-2-olato(2 –)-N,O,O'}(piperidine-N)nickel(II)

Bis(N-n-butyl-2-hy­droxy-1-naphthaldiminato)nickel(II)

A Silver(I) Complex of a Tube-Shaped Hydrocarbon

Manganese(II) Tri­phenylacetate Hydrate, a Manganese(II) Complex with a Chain Structure

Absolute Configuration of (+)₅₈₉-(4,4'-Di­meth­oxy-2,2'-bi­pyridine 1,1'-dioxide-O,O')bis­(ethylene-di­amine-N,N')cobalt(III) Triperchlorate

Carbonyl(1,3-di­phenyl-1,3-propanedionato-O,O')(4-methyl-2,6,7-trioxa-1-phosphabi­cyclo[2.2.2]octane-P)rhodium(I)

Iodo(1,10-phenanthroline-N,N')(tri­phenylphosphine)copper(I)

Exopolyhedral Cyclized Platinaundecaboranes: [(PPh₃)(PhCOS)PtB₁₀H₁₁].0.5CH₂Cl₂

1-Bromomercurio-2-(2,5,8,11,14-pentaoxa­penta­decyl)benzene

Organization of the Cavity in a Bi­pyridyl Crown Ether Through Coordination with PdCl₂

[(1,2,5,6-η)-Cyclo­octa­tetra­ene­](η⁵-cyclo­pentadienyl)cobalt

6,6-Bis[3-(di­methylamino)-1,1-di­methylpropyl]-2,2,4,4-tetra­methyl-1,3,5-trioxa-2,4-disila-6-stanna­cyclo­hexane

Aqua(1,10-phenanthroline-N,N')(μ₃-thio­sulfato-S:S:O)cadmium(II) Hydrate

Di-μ-phenylthio-bis­[bis­(tri­ethylphosphine-P)platinum(II)] Bis(hexa­fluorophosphate), [Pt₂(μ-SPh)₂(PEt₃)₄](PF₆)₂

Hexa­aquacobalt(II) Bis(hydrogen cyclo­propane-1,1-di­carboxylate)

(2R,3S)-3-Phenyl-2-[(2S,4S)-4-phenyl-3-tosyl-1,3-oxazolidin-2-yl]cyclo­pentanone

2,3,4,5-Tetra­hydro­cyclohepta[b]pyrido[2,1-a]benzimidazole-7-carbo­nitrile

1,2,3,4-Tetra­hydrobenzimidazo[2,1-b]quinazoline

A Triclinic Polymorph of Hexa­phenylcyclotrisiloxane

2,6-Di­bromo-4-nitroaniline

17β-Hydroxymethyl-3-meth­oxy-19,21-dinorestra-1,3,5(10)-trieno-18,20-lactone

(9-Anthrylmethyl)bis­(2-pyridylmethyl)amine

3-[(2-Amino­ethyl)imino­methyl]-4-hydroxybenzoic Acid 0.28-Hydrate

N—H⋯S and N-H⋯Ph Hydrogen Bonding in 1-(2-Fluoro­phenyl)thiourea

2',4'-Di­hydroxy-2-[3-(4-methylphenyl)isoxazol-5-yl]aceto­phenone

9,10-Di­hydro-1,4-di­meth­oxy-5,8-di­methyl-cis-9,10-di­phenyl-9,10-anthracenediol, a Crowded Planar 9,10-Di­hydroanthracene

Characterization of Quinoline Derivatives. II. 7-(4-Methyl-1-piperazinyl)-6H-[1]benzo­pyrano[3,4-c]quinoline

N,N'-Bis(2-pyridylmethyl)di­thiooxamide

1,4-Bis(3-pyridyl­oxy)benzene

(−)-(2S)-Tifluadom Hydrochloride and Two of its (−)-(2S)-2-(Acylamino­methyl)benzodiazepine Hydrochloride Analogues

N-(2-Bromo-4-methylphenyl)naphthaldimine

3α-Bikhaconine Acetone Solvate

(1'S,5'S,6'R,8'S)-1-[(6'-Acet­oxy-8'-hy­droxy-2'-oxabi­cyclo[3.2.1]oct-5'-yl)oxymethyl]-N⁴-benzoylcytosine

(1α,3α,5α)-1,3,5-Tri­methyl-1,3,5-cyclo­hexanetri­carboxylic Acid Aceto­nitrile Solvate

3-tert-Butyl-2'-chloro-2-hy­droxy-5-methylazo­benzene

N-(2-Di­methoxymethyl-3-hy­droxy-2-methyl-6-nitro-3,4-di­hydro-2H-1-benzo­pyran-4-yl)acetamide

α-Naphthyl Phenyl Pinacols

10-Ethyl-3-nitropheno­thiazine

(Z)-5-(1-Meth­oxy-2-naphthylmethylene)-4-oxo-2-thioxo-1,3-thiazolidine-3-acetic Acid Di­methyl Sulfoxide Solvate

2,2'-Biphenol

(20S)-3β-Hydroxyholosta-7,9-diene

D-Secoestrone Derivatives. IV. 3-Hy­droxy-18-methyl-17-oxaestra-1,3,5(10)-trien-16-one

1H-Tetrazol-5(4H)-one

(7R,8S,10bR)-7,8-Di­hydroxy-1,5,6,7,8,9,10,10b-octa­hydro-3H-1,3-oxazolo[4,3-a]isoquinolin-3-one

N-Benzyl-N-(tert-butyloxycarbonyl)glycine, an N-Substituted Glycine (Peptoid) Monomer

9-De­oxy-15-hy­droxy- and 9-De­oxy-19-hydroxycotylenol

5,5-Di­phenyl-2-thiohydantoin

Racemic 2-Hy­droxy-2-phenylpropanamidinium Chloride and (S)-2-Hy­droxy-2-phenylbutanamidinium (R)-2-Hy­droxy-2-phenylethanoate

sp-9-[o-(β-Chloro-α,α-di­methylethyl)phenyl]fluorene: an Unanticipated Exclusive Product from the Reaction of sp-9-(o-tert-Butylphenyl)-9-fluorenol with Thionyl Chloride

3,4-Bis(1-adamantyl)-1,2-dithiete: the First Structurally Characterized Dithiete Unsupported by a Ring or Benzenoid Frame

8-Aminoquinolinium Chloride Dihydrate

(±)-4-Oxo-1,2,3,4-tetra­hydro­naphthalene-1-carboxylic Acid: Hydrogen Bonding and Carboxyl Disordering in a δ-Keto Acid

β-Di­hydroentandrophragmin–Ethyl Acetate (1/0.355)

ortho-(1-Naphthoyl)benzoic Acid

1-Phenethylguanidinium Chloride

Cyclo­propylcarboxamidinium Chloride

myo-Inositol 1,3,5-Bicyclic Phosphate

Comment on Interwoven Hydrogen-Bonding Networks in Benzene-1,3,5-tri­acetic Acid by Fitzgerald & Gerkin (1997)

A re-examination of the structure of benzene-1,3,5-triacetic acid reported by Fitzgerald & Gerkin [Acta Cryst. (1997), C53, 967-969].

Response to Batten's (1998) Comment on Interwoven Hydrogen-Bonding Networks in Benzene-1,3,5-tri­acetic Acid

A response to the comment by Batten [Acta Cryst. (1998), C54, 1193].