One-pot synthesis of {Mo6 I8 }4+ -doped polystyrene microspheres via a free radical dispersion copolymerisation reaction:{Mo6 I8 }4+ -doped polystyrene microspheres via free radical copolymerisation

Molybdenum octahedral clusters, when incorporated into an appropriate polymer matrix, are considered as promising agents for a range of biological applications. This work describes the one-pot synthesis, morphology and cellular toxicity of nano-sized polystyrene beads doped with luminescent cluster complexes [(Mo6X8)(NO3)6]2- (X=Cl, Br or I). Specifically, the particles were obtained by free radical dispersion copolymerisation of styrene and methacrylic acid or 4-vinylpyridine in the presence of the cluster complexes. The effects of the cluster loading in the reaction mixture on both the content of the final material and number-average molar mass of the copolymers were evaluated

Hooded crows (Corvus cornix) manufacture objects relative to a mental template

It was recently found that not only tool-specialized New Caledonian crows, but also Goffin cockatoos can manufacture physical objects in accordance with a mental template. That is, they can emulate features of existing objects when they manufacture new items. Both species spontaneously ripped pieces of card into large strips if they had previously learned that a large template was rewarded, and small strips when they previously learned that a small template was rewarded. Among New Caledonian crows, this cognitive ability was suggested as a potential mechanism underlying the transmission of natural tool designs. Here, we tested for the same ability in another non-specialised tool user–Hooded crows (Corvus cornix). Crows were exposed to pre-made template objects, varying first in colour and then in size, and were rewarded only if they chose pre-made objects that matched the template. In subsequent tests, birds were given the opportunity to manufacture versions of these objects. All three crows ripped paper pieces from the same colour material as the rewarded template, and, crucially, also manufactured objects that were more similar in size to previously rewarded, than unrewarded, templates, despite the birds being rewarded at random in both tests. Therefore, we found the ability to manufacture physical objects relative to a mental template in yet another bird species not specialized in using or making foraging tools in the wild, but with a high level of brain and cognitive development.</p

Кристаллическая структура трис-(2,3,5,6-тетрафторбензоато)скандия [Sc(C₆F₄HCO₂)₃]

The heating of a mixture of as-precipitated scandium hydroxide and tetrafluoroterephthalic acid in methanol is accompanied by acid decarboxylation and the formation of a tris-(2,3,5,6-tetrafluorobenzoato)scandium complex compound. According to the data of the single crystal X-ray diffraction analysis, the compound has a chain structure due to the carboxylate anion functioning as a m2-bridging ligand. The polymer chains are linked together by p-p interactions between the phenyl rings.Нагревание смеси свежеосажденного гидроксида скандия и тетрафтортерефталевой кислоты в метаноле сопровождается декарбоксилированием кислоты и образованием комплексного соединения трис-(2,3,5,6-тетрафторбензоато)скандия. По данным рентгеноструктурного анализа соединение имеет цепочечное строение вследствие того, что карбоксилат-анион выступает в качестве μ2-мостикового лиганда. Связывание полимерных цепей происходит за счет π-π-взаимодействий между фенильными кольцами

Crystal Structure of Tris- (2,3,5,6-Tetrafluorobenzoato)Scandium [Sc(C6F4HCO2)3]

The heating of a mixture of as-precipitated scandium hydroxide and tetrafluoroterephthalic acid in methanol is accompanied by acid decarboxylation and the formation of a tris-(2,3,5,6- tetrafluorobenzoato)scandium complex compound. According to the data of the single crystal X-ray diffraction analysis, the compound has a chain structure due to the carboxylate anion functioning as a μ2-bridging ligand. The polymer chains are linked together by interactions between the phenyl rings. © 2018, Pleiades Publishing, Ltd

Crystal Structure of Tris- (2,3,5,6-Tetrafluorobenzoato)Scandium [Sc(C6F4HCO2)3]

The heating of a mixture of as-precipitated scandium hydroxide and tetrafluoroterephthalic acid in methanol is accompanied by acid decarboxylation and the formation of a tris-(2,3,5,6- tetrafluorobenzoato)scandium complex compound. According to the data of the single crystal X-ray diffraction analysis, the compound has a chain structure due to the carboxylate anion functioning as a μ2-bridging ligand. The polymer chains are linked together by interactions between the phenyl rings. © 2018, Pleiades Publishing, Ltd

Кристаллическая структура трис-(2,3,5,6-тетрафторбензоато)скандия [Sc(C₆F₄HCO₂)₃]

The heating of a mixture of as-precipitated scandium hydroxide and tetrafluoroterephthalic acid in methanol is accompanied by acid decarboxylation and the formation of a tris-(2,3,5,6-tetrafluorobenzoato)scandium complex compound. According to the data of the single crystal X-ray diffraction analysis, the compound has a chain structure due to the carboxylate anion functioning as a m2-bridging ligand. The polymer chains are linked together by p-p interactions between the phenyl rings.Нагревание смеси свежеосажденного гидроксида скандия и тетрафтортерефталевой кислоты в метаноле сопровождается декарбоксилированием кислоты и образованием комплексного соединения трис-(2,3,5,6-тетрафторбензоато)скандия. По данным рентгеноструктурного анализа соединение имеет цепочечное строение вследствие того, что карбоксилат-анион выступает в качестве μ2-мостикового лиганда. Связывание полимерных цепей происходит за счет π-π-взаимодействий между фенильными кольцами

Metal-organic frameworks based on octafluorobiphenyl-4,4′-dicarboxylate: Synthesis, crystal structure, and surface functionality

In contrast to aromatic carboxylates, the coordination polymers based on their perfluorinated analogues are not numerous. Here we present a series of six Zn(ii) coordination polymers of different dimensionalities (1D, 2D, and 3D) and porosities based on octafluorobiphenyl-4,4′-dicarboxylate (oFBPDC2-) and N-containing co-ligands (ur, dabco, and bpy). These complexes are characterized by single-crystal X-ray diffraction, PXRD, FT-IR, elemental analysis, and TGA. The metal-organic frameworks [Zn2(CH3CONH2)2(oFBPDC)2] (1) and [Zn2(oFBPDC)2(dabco)] (4) are shown to be porous with BET surface areas of 470 m2 g-1 and 441 m2 g-1, respectively. In addition, compound 4 shows selectivity factors of 11.3, 4.9 and more than 6 for the binary gas mixtures CO2/N2, CO2/CH4 and benzene/cyclohexane, respectively. The measurements for pressed powders and water droplet give water contact angles of 136° for 4 and 133° for (H2bpy)[Zn2(bpy)(oFBPDC)3] (5). Low water uptake indicates that both 4 and 5 belong to highly hydrophobic solids. © The Royal Society of Chemistry

Synthesis, supramolecular isomerism, and photoluminescence of scandium(iii) complexes with a tetrafluoroterephthalate ligand

Here we present a new family of seven Sc(iii) complexes with a tetrafluoroterephthalate ligand (tFBDC2−), having non-polymeric and polymeric 2D and 3D structures. These complexes are characterized by SC XRD, PXRD, FT-IR, elemental analysis, and TGA. Among these complexes, 3D coordination polymers [Sc(H2O)(tFBDC)1.5]·H2O (1), [Sc2(H2O)2(tFBDC)3]·2H2O (2), and [Sc(H2O)(tFBDC)1.5]·4H2O (3) are supramolecular isomers. Complex 1 is obtained as a phase pure material, while 2 and 3 are found as admixtures. The reaction of Sc(CF3SO3)3 with H2tFBDC in the presence of NH3 as a base produces layered coordination polymer [Sc(H2O)(OH)(tFBDC)] (4). Complexes (NH4)[Sc(H2O)4(tFBDC)2]·5H2O (5), [K(H2O)2Sc(H2O)4(tFBDC)2]·3H2O (6) and [Cs(H2O)4Sc(H2O)4(tFBDC)2]·0.5H2O (7) based on the same [Sc(H2O)4(tFBDC)2]− anionic unit are obtained by precipitation with NH3, KOH or CsOH. Coordination polymers 1 and 4 are stable in an aqueous solution in the range of pH 2-12. Solid complexes 1, 4-7 show ligand-centred purple/blue photoluminescence, with 1 and 4 having high quantum yields of 28 and 34% at room temperature. © The Royal Society of Chemistr

Metal-organic frameworks based on octafluorobiphenyl-4,4′-dicarboxylate: Synthesis, crystal structure, and surface functionality

In contrast to aromatic carboxylates, the coordination polymers based on their perfluorinated analogues are not numerous. Here we present a series of six Zn(ii) coordination polymers of different dimensionalities (1D, 2D, and 3D) and porosities based on octafluorobiphenyl-4,4′-dicarboxylate (oFBPDC2-) and N-containing co-ligands (ur, dabco, and bpy). These complexes are characterized by single-crystal X-ray diffraction, PXRD, FT-IR, elemental analysis, and TGA. The metal-organic frameworks [Zn2(CH3CONH2)2(oFBPDC)2] (1) and [Zn2(oFBPDC)2(dabco)] (4) are shown to be porous with BET surface areas of 470 m2 g-1 and 441 m2 g-1, respectively. In addition, compound 4 shows selectivity factors of 11.3, 4.9 and more than 6 for the binary gas mixtures CO2/N2, CO2/CH4 and benzene/cyclohexane, respectively. The measurements for pressed powders and water droplet give water contact angles of 136° for 4 and 133° for (H2bpy)[Zn2(bpy)(oFBPDC)3] (5). Low water uptake indicates that both 4 and 5 belong to highly hydrophobic solids. © The Royal Society of Chemistry