Semisynthesis and absolute configuration of a novel rearranged 19,20-δ-lactone (9βH)-pimarane diterpene

Semisynthesis, rearrangment, absolute configuration and changes in the ring puckers of a novel 19,20-δ-lactone (9βH)-pimarane started from the natural product annona­lide, which has also been redetermined here.

Crystal polymorphs of 6-[(phenyl­carbamo­yl)­oxy]hexa-2,4-diyn-1-yl isonicotinate

Two polymorphic structures of the di­acetyl­ene 6-[(phenyl­carbamo­yl)­oxy]hexa-2,4-diyn-1-yl isonicotinate are reported. One polymorph was inert to polymerization, but the other showed polymerization reactivity by thermal annealing or photoirradiation.

First heterobimetallic Ag^I–Co^III coordination compound with both bridging and terminal –NO₂ coordination modes: synthesis, characterization, structural and computational studies of (PPh₃)₂Ag^I–(μ-κ²O,O′:κN-NO₂)–Co^III(DMGH)₂(κN-NO₂)

An unusual heterobimetallic bis­(tri­phenyl­phosphane)(NO₂)Ag^I–Co^III(di­methyl­glyoximate)(NO₂) coordination compound with both bridging and terminal –NO₂ (nitro) coordination modes has been isolated from the reaction of [CoCl(DMGH)₂(PPh₃)] (DMGH is di­methyl­glyoximate) with excess AgNO₂ and was characterized by X-ray crystallography, different spectroscopic techniques and electrospray ionization mass spectrometery (ESI–MS).

Construction of a three-dimensional supra­molecular framework based on an anionic cadmium(II) coordination network and protonated di­pyridine organic cations

The hydro­thermal reaction between Cd(NO₃)₂·4H₂O, benzene-1,2,4,5-tetra­carb­oxy­lic acid and 1,4-bis­(pyridin-4-yl)buta-1,3-diene produced a three-dimensional anionic coordination network with tubular channels. The cavities of the anionic network are occupied by protonated pyridinium cations. Inter­estingly, the organic cations connect the anionic coordination network through hydrogen bonds to form a complicated supra­molecular framework with photoluminescence properties.

Substituent effects of two isophthalate derivatives on the construction of cadmium coordination polymers incorporating a di­pyridyl ligand

Two coordination polymers with different structures have been prepared under hydro­thermal conditions, based on mixtures of Cd(NO₃)₂·4H₂O and trans-1-(2-amino­pyridin-3-yl)-2-(pyridin-4-yl)ethene with two similar di­carb­oxy­lic acids (5-methyl­isophthalic acid or 5-hy­droxy­isophthalic acid). Both of these compounds exhibit good thermal stability and photoluminescence properties.

Structural and spectroscopic characterization of a new luminescent Ni^II complex: bis­{2,4-di­chloro-6-[(2-hy­droxy­prop­yl)imino­meth­yl]phenolato-κ³O,N,O′}nickel(II)

A new luminescent Ni^II complex has been synthesized and characterized by elemental analysis, UV–Vis, FT–IR, ¹H NMR, ¹³C NMR and photoluminescence spectroscopies, LC–MS/MS and single-crystal X-ray diffraction.

Supra­molecular architecture in aza­heterocyclic phospho­nates. III. Structures of an ethyl phos­phonamidate and an ethyl phos­phonate

The supra­molecular architectures of the crystal structures of two phospho­rylated aza­heterocycles were characterized using X-ray diffraction analysis. One of them is dominated by two infinite chains composed of unique symmetry-independent mol­ecules linked by distinctively different synthons, while the second structure adopts a ladder packing topology.

Single crystals of the filled Ti₂N-type η-phase Ti₃Zn₃O_x (x = 1.07 and 1.23) prepared using a Bi flux

The crystal structures of filled Ti₂Ni-type Ti₃Zn₃O_1.03 and Ti₃Zn₃O_1.27 were analysed by X-ray diffraction for single crystals prepared using a Bi flux. A new inter­stitial O-atom site and split sites of the Ti and Zn atoms were found for Ti₃Zn₃O_1.27.

Polymorphic phase transformations of 3-chloro-trans-cinnamic acid and its solid solution with 3-bromo-trans-cinnamic acid

Pure γ polymorphs of 3-chloro- and 3-bromo-trans-cinnamic acids are isostructural and undergo irreversible thermal transformation to different β polymorphs at similar temperatures. A transformation also occurs for the γ form of their solid solution, with a molar ratio close to 1:1, producing a form similar to pure β-3-chloro-trans-cinnamic acid.

Making an order: the concerted alignment of [MOF₅]²⁻ (M = Nb and Ta) dipolar anions in one-dimensional coordination chains sustained by tris­(3,4,5-tri­methyl-1H-pyrazole)­copper(II)

Two new Cu^II complexes based on 3,4,5-trimethyl-1H-pyrazole ligands and [MOF₅]²⁻ (M = Nb and Ta) inorganic bridges feature one-dimensional chains, which exhibit strict orientational order of the polar anions and deliver a protocol for the rational construction of polar infinite structures.

A first Mn member in the struvite morphotropic series, CsMn(H₂O)₆(PO₄): hydro­thermal synthesis, crystal structure and inter­connections within the family of related phosphates

The first Mn member of the struvite morphotropic series, CsMn(H₂O)₆(PO₄), has been synthesized hydro­thermally and its hexa­gonal crystal structure was determined. It is shown that the size of the A⁺ ionic radius within the morphotropic series AM(H₂O)₆(XO₄) affects the type of crystal structure and the values of the unit-cell parameters. Structural relationships with Na(H₂O)Mg(H₂O)₆(PO₄) and the mineral hazenite, KNa(H₂O)₂Mg₂(H₂O)₁₂(PO₄)₂, are discussed.

Exploring a solvated dimer of Gefitinib: a qu­anti­tative analysis

Gefitinib (or Iressa) exists in two polymorphic forms, a stable form I and a metastable form II. A methanol solvated form was synthesized and was investigated theoretically and experimentally.

Synthesis and characterization of two one-dimensional Cd^II coordination polymers (CPs) with 5-amino-2,4,6-tri­bromo­isophthalic acid and flexible N-donor bi­pyridyl ligands

Two one-dimensional Cd^II coordination polymers with 5-amino-2,4,6-tri­bromo­isophthalic acid (H₂ATBIP) and flexible N-donor bipyridyl ligands have been synthesized and characterized.

Synthesis and crystal structure of an M₄L₆ tetra­hedral cage with outward-facing pockets from a substituted pyrazol­yl–pyridine ligand

A new Co₄L₆ tetra­hedral cage constructed from a substituted pyrazol­yl–pyridine ligand has been synthesized and structurally characterized. The [Co₄L₆ClO₄]⁷⁺ cage exhibits outward-facing pockets at each corner of the tetra­hedron.

A two-dimensional cadmium(II) coordination polymer constructed from 4-carb­oxy-1-(4-car­box­ylatobenz­yl)-2-propyl-1H-imidazole-5-carboxyl­ate and 1-(4-carboxyl­atobenz­yl)-2-propyl-1H-imid­azole-4-carboxyl­ate ligands

A two-dimensional Cd^II coordination polymer was assembled from 1-(4-carboxyl­benz­yl)-2-propyl-1H-imidazole-4,5-di­carb­oxy­lic acid and 1-(4-carb­oxy­benz­yl)-2-propyl-1H-imidazole-4-carb­oxy­lic acid ligands and is described as a 3,6-coordinated complex with a (4³)₂(4⁶.6⁶.8³) topology network. The solid-state photoluminescence properties of the new complex were investigated.

Why are reactions of 2- and 8-thio­quinoline derivatives with iodine different?

The reaction of 1,4-bis­(quinolin-2-ylsulfan­yl)but-2-yne with iodine leads to two different single crystals, namely the dimonoiodide hemihydrate and the monoiodide triiodide of the 1,2-di­hydro-1,1′-bi[thia­zolo[3,2-a]quinoline]-10a,10a′-diium dication. Inter­action of the iodide anions with the dication takes place through chalcogen bonds.

Synthesis, crystal structure and topological analysis of a three-dimensional polymeric network based on zinc(II), potassium and 5-sulfo­benzene-1,3-di­carboxyl­ate (SIP)

A three-dimensional zinc(II) coordination polymer was synthesized using 5-sulfo­benzene-1,3-di­carboxyl­ate (5-sulfoisophthalate) monosodium salt, KOH and Zn²⁺. The topological analyses revealed that K—O inter­actions form a two-dimensional network and the coordination of the Zn²⁺ ions gives rise to a three-dimensional network.

Two furan-2,5-di­carb­oxy­lic acid solvates crystallized from di­methyl­formamide and di­methyl sulfoxide

The crystal structures of furan-2,5-di­carb­oxy­lic acid (FDCA) di­methyl­formamide disolvate and dimethyl sulfoxide monosolvate were determined using single-crystal X-ray diffraction and exhibit hydrogen bonds between the FDCA and solvent molecules. A two-dimensional network is formed in the DMSO solvate.