Phosphorus-nitrogen compounds. 26. Molecular motion and molecular separations in cyclophosphazene clathrates

Allcock, Harry R.; Allen, Robert W.; Bissell, E. C.; SMELTZ, L. A.; Teeter, Martha M.

doi:10.1021/ja00433a012

Cited by 70 publications

(77 citation statements)

References 3 publications

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“…Unfortunately, the results for the filtrate fraction reveal minimal concentration of the polyunsaturated 18:3 methyl ester in the uncomplexed fraction, as shown in Figure 4b, with a K U,18:3 of 1.9. These results are similar to previous reports of inclusion complexation performed in the presence of a large excess of guest material (Allcock et al, 1976;Caira et al, 1997;Pivovar et al, 2001). In these cases, the target compound is selectively included, leading to its enrichment and large K C , but the insufficient quantity of host material results in little change in the filtrate composition from its initial value.…”

Section: Crystallization From Methanolsupporting

confidence: 90%

“…Several inclusion networks have been reported in which the target compound is the selectively included guest, often crystallized in the presence of a large excess of guests (Allcock et al, 1976;Caira et al, 1997;Pivovar et al, 2001). In this case a high purity phase will result for an inclusion network with a high K C , the selectivity coefficient for the target compound.…”

Section: Resultsmentioning

confidence: 99%

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Separation of polyunsaturated fatty acids by selective inclusion in guanidinium‐1,5‐naphthalenedisulfonate‐2‐methoxyethanol host networks

Voogt

Blanch

2005

Biotech & Bioengineering

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Hydrogen-bonded networks composed of guanidinium (G) and 1,5-naphthalenedisulfonate (NDS) have been developed for the selective inclusion and separation of fatty acid esters based on their degree of unsaturation. Porous crystalline networks have been synthesized and include fatty acid esters during crystallization from both methanol and 2-methoxyethanol. Crystalline networks formed in methanol are selective for the inclusion of saturates in preference to polyunsaturated fatty acid methyl esters, but their applicability is limited by the competing inclusion of the solvent methanol. In 2-methoxyethanol, a three-component host structure is formed that provides 4.1 x 4.7 A2 pores which are also selective for saturated fatty acid ester inclusion. These networks do not suffer from the competing inclusion of the solvent 2-methoxyethanol as is the case with methanol, and thus complete removal of initial saturated fatty acid 2-methoxyethyl esters is possible. Binary selectivity experiments on mixtures of the 2-methoxyethyl esters of saturated stearic acid and the omega-3 fatty acid alpha-linolenic acid reveal that this three-component network structure provides nearly complete resolution of these two guests in the crystal and filtrate fractions. Separation of the 2-methoxyethyl esters of alpha-linolenic acid from the monounsaturated oleic acid is also possible, although with decreased efficiency in comparison to removal of the saturated fatty acid ester.

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Section: Crystallization From Methanolsupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Separation of polyunsaturated fatty acids by selective inclusion in guanidinium‐1,5‐naphthalenedisulfonate‐2‐methoxyethanol host networks

Voogt

Blanch

2005

Biotech & Bioengineering

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“…3b) of the PECONFs showed signals in the range from 0 to − 25 p.p.m. which are typical for P(V)N 4 tetrahedra 25,26,28 . In PECONF-1, two strong, and one weak signal were observed at 0.4, − 10.4, and − 22.5 p.p.m., respectively.…”

Section: Mas Nmr Spectroscopymentioning

confidence: 94%

“…1) in simple polycondensation reactions using dimethylsulphoxide (DMSO) as the solvent. DAB acts as the electron-rich aromatic building block [25][26][27] due to its four amino groups while hexachlorocyclotriphosphazene has the role of the nitridic building unit. These building blocks are significantly less expensive than those used for covalent organic frameworks and polymers typically used so far [21][22][23][24] .…”

Section: Synthesismentioning

confidence: 99%

Porous covalent electron-rich organonitridic frameworks as highly selective sorbents for methane and carbon dioxide

2011

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Carbon dioxide capture from point sources like coal-fired power plants is considered to be a solution for stabilizing the Co 2 level in the atmosphere to avoid global warming. methane is an important energy source that is often highly diluted by nitrogen in natural gas. For the separation of Co 2 and CH 4 from n 2 in flue gas and natural gas, respectively, sorbents with high and reversible gas uptake, high gas selectivity, good chemical and thermal stability, and low cost are desired. Here we report the synthesis and Co 2 , CH 4 , and n 2 adsorption properties of hierarchically porous electron-rich covalent organonitridic frameworks (PEConFs). These were prepared by simple condensation reactions between inexpensive, commercially available nitridic and electron-rich aromatic building units. The PEConF materials exhibit high and reversible Co 2 and CH 4 uptake and exceptional selectivities of these gases over n 2 . The materials do not oxidize in air up to temperature of 400 °C.

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“…Iwamoto, 1979). In inclusion structures with imperfect geometric relationships and lacking specific bindings between the complex constituents the guest species are either disordered or thermally smeared within the rigid host lattice (Allcock, Allen, Bissell, Smeltz & Teeter, 1976;Goldberg, 1982). Solvation forces, undoubtedly, play a major role in determining the crystal-structure type of the inclusion compound formed.…”

mentioning

confidence: 99%

Inclusion behavior of 2-hydroxy-3,5-dinitro-N'-(5-nitrofurfurylidene)benzohydrazide, C12H7N5O9. Crystal structures with acetonitrile and acetic acid

Goldberg¹,

Stein²

1984

Acta Crystallogr C

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The solvent guest species are included in pseudochannels formed between layers of the hydrazide molecules. Structural differences between the two compounds are mainly due to the different functionality of the solvent environments as revealed by observed hydrogen-bonding patterns. They reflect a considerable influence of the solvation forces on the host conformation, as a result of which polymorphic crystalstructure types are formed.

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Phosphorus-nitrogen compounds. 26. Molecular motion and molecular separations in cyclophosphazene clathrates

Cited by 70 publications

References 3 publications

Separation of polyunsaturated fatty acids by selective inclusion in guanidinium‐1,5‐naphthalenedisulfonate‐2‐methoxyethanol host networks

Separation of polyunsaturated fatty acids by selective inclusion in guanidinium‐1,5‐naphthalenedisulfonate‐2‐methoxyethanol host networks

Porous covalent electron-rich organonitridic frameworks as highly selective sorbents for methane and carbon dioxide

Inclusion behavior of 2-hydroxy-3,5-dinitro-N'-(5-nitrofurfurylidene)benzohydrazide, C12H7N5O9. Crystal structures with acetonitrile and acetic acid

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