- Hydrogen-bonded network in biphenyl-4,4′-diphospho-nic acid
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The crystal structure of the title compound, C12H12O6P2, displays two different regions alternating along the a axis: a hydrogen-bonded region encompassing the end-positioned phospho-nic acid groups and a hydro-phobic region formed by the aromatic spacers. The asymmetric unit contains only half of the biphenyl-4,4′-diphospho-nic acid (4,4′-bpdp) mol-ecule, which is symmetric with an inversion centre imposed at the mid-point between the two aromatic rings. The periodic organization of the mol-ecules is controlled by two strong O - H...O inter-actions between the phospho-nic acid sites. Weak C - H...π inter-actions are established in the aromatic regions. International Union of Crystallography 2007.
- Prochniak,Zon,Daszkiewicz,Pietraszko,Videnova-Adrabinska
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- Sulfonated microporous organic-inorganic hybrids as strong bronsted acids
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It has been discovered that the use of excess zirconium in reactions with 4,4′-biphenyl and 4,4′-terphenylbis(phosphonic acid) in DMSO or DMSO-ethanol mixtures produces microporous inorganic-organic hybrids. Surface areas of 400 m2/g and pore sizes in the range of 10-20 A in diameter are routinely obtained. These materials are readily sulfonated with SO3 under pressure to yield strong Bronsted acids. The acid strength, measured by 13C NMR shifts of acetone and cyclopentanone in contact with the sulfonates, indicates an acidity close to that of 100% H 2SO4. Condensation and cracking reactions were obtained for both ketones under mild conditions. A working hypothesis is presented to account for the high surface area and microporosity. The combination of high surface areas and pore dimensions that are between those of zeolites and mesoporous silicas commends these materials for applications in separations, ion exchange, and catalysis.
- Wang, Zhike,Heising, Joy M.,Clearfield, Abraham
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- C-P bond formation of cyclophanyl-, and aryl halides: Via a UV-induced photo Arbuzov reaction: A versatile portal to phosphonate-grafted scaffolds
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A new versatile method for the C-P bond formation of (hetero)aryl halides with trimethyl phosphite via a UV-induced photo-Arbuzov reaction, accessing diverse phosphonate-grafted arenes, heteroarenes and co-facially stacked cyclophanes under mild reaction
- Br?se, Stefan,Hassan, Zahid,Nieger, Martin,O?wald, Simon,Zippel, Christoph
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p. 3309 - 3312
(2022/02/11)
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- Scalable synthesis of multi-substituted aryl-phosphonates: Exploring the limits of isoretical expansion and the synthesis of new triazene-based phosphonates
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The development of novel multi-substituted aryl-phosphonate compounds offers promise as new building blocks for metal-organic frameworks (MOFs) materials with excellent properties in regards to porosity and gas sorption. We demonstrate the efficiency of t
- Barbee, Derek,Barron, Andrew R.
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p. 231 - 244
(2020/01/03)
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- Efficient energy and electron transfer between donor and acceptor chromophores in aluminophosphate hybrid materials
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The first organic-inorganic hybrid materials (OIHMs) having one or a combination of two chromophores in different ratios are obtained from the aryl phosphonic acid and aluminum lactate via sol gel process. The structures of these OIHMs are analyzed by the 27Al and 31P NMR. The fluorescence resonance energy transfer (FRET) as well as photoinduced electron transfer (PET) between donor and acceptor chromophores in these hybrid materials have been investigated and the efficiencies can be up to 97 and 93%, respectively.
- Lo, Chih-Yuan,Chen, Chih-Hsien,Tsai, Tim W. T.,Zhang, Long,Lim, Tsong-Shin,Fann, Wunshain,Chan, Jerry C. C.,Luh, Tien-Yau
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experimental part
p. 539 - 546
(2011/04/22)
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- SYNTHESIS OF ARYL- AND HETARYLPHOSPHONATES
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The reaction of tris(trimethylsilyl) phosphite with aryl or hetaryl halides under homogeneous catalysis conditions gave bis(trimethylsilyl)phosphonates.Treatment of these products with methanol gave the corresponding aryl- or hetarylphosphonic acids in quantitative yield.Keywords: tris(trimethylsilyl) phosphite, aryl and hetaryl halides, homogeneous catalysis, bis(trimethylsilyl)phosphonates, arylphosphonic acids.
- Demnik, N. N.,Kabachnik, M. M.,Novikova, Z. S.,Beletskaya, I. P.
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p. 1913 - 1915
(2007/10/02)
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- Mesoporous crystalline solid compound of a diphosphonate/phosphite of a tetravalent metal, with a narrow distribution of mesopores
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The present invention discloses a compound comprising a diphosphonate/phosphite of a tetravalent metal: (where M, R, x and y have the meaning given in the description), in the form of a crystalline solid with an alpha-type lamellar structure with a distance between layers of 7.4 to 20? (depending on the dimensions of radical R), a BET surface area of 250 to 400m2 /g, and porosity within the mesopore range, with at least 50% of the pores measuring 20 to 30?. The compound, depending on the radical R used, may or may not have microporosity in the region between layers. Such a diphosphonate/phosphite of a tetravalent metal is obtained by reaction between diphosphonic acid, phosphorous acid and an oxyhalide of a tetravalent metal, in a solvent comprising dimethyl-sulphoxide/water containing hydrofluoric acid.
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- Mesoporous crystalline compound of a tetravalent metal
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The present invention discloses a compound comprising a diphosphonate/phosphite of a tetravalent metal:, , M[(O3P-R-PO3)1-(x+y)(HPO3)2X(O3P-R-PO3H2)2y], , (where M, R, x and y have the meaning given in the description), in the form of a crystalline solid with an alpha-type lamellar structure with a distance between layers of 7.4 to 20? (depending on the dimensions of radical R), a BET surface area of 250 to 400m2/g, and porosity within the mesopore range, with at least 50% of the pores measuring 20 to 30?. The compound, depending on the radical R used, may or may not have microporosity in the region between layers. Such a diphosphonate/phosphite of a tetravalent metal is obtained by reaction between diphosphonic acid, phosphorous acid and an oxyhalide of a tetravalent metal, in a solvent comprising dimethyl-sulphoxide/water containing hydrofluoric acid.
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