A Flexible Germanate Structure Containing 24-Ring Channels and with Very Low Framework Density

Plévert, Jacques; Gentz, Travis M.; Laine, Aaron; Li, Hailian; Yaghi, Omar M.; O’Keeffe, Michael

doi:10.1021/ja016996a

Cited by 162 publications

(98 citation statements)

References 16 publications

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“…Nichtlineare optische Eigenschaften lassen sich durch Einführung organischer Farbstoffe erzeugen. [242,243] [211,[268][269][270][271][272] allerdings sind die Strukturänderungen weit weniger drastisch als bei Koordinationspolymeren, da die Gerüste typischerweise auf starken Bindungen wie Si-O-oder Al-O-Bindungen basieren. Ein Gerüst, dessen Porengröße durch die Temperatur einstellbar ist, wurde bei einem Zeolith mit oktaedrischen und tetraedrischen Baueinheiten entdeckt, [273] 4 ]·x H 2 O} n (M = Co, x = 4; Ni, x = 4; Zn, x = 2), besteht aus M(NO 3 ) 2 -und 4,4'-bpy-Einheiten und lässt sich als "Nut-und-Feder-Struktur" beschreiben (Abbildung 29 a).…”

Section: Schichten (2d-räume)unclassified

Funktionale poröse Koordinationspolymere

2004

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Die Chemie der Koordinationspolymere hat sich in den vergangenen Jahren rasant entwickelt. Strukturen aus einer Vielzahl molekularer Bausteine mit unterschiedlichen Wechselwirkungen sind mittlerweile zugänglich. Die nächste Stufe ist die chemische und physikalische Funktionalisierung dieser Architekturen durch Einstellung ihrer Porositäten. Dieser Aufsatz konzentriert sich auf drei Aspekte von Koordinationspolymeren: 1) Anwendung von Kristall‐Engineering zum Aufbau poröser Gerüste aus Konnektoren und Linkern (“Nanospace‐Engineering”), 2) Charakterisierung und Katalogisierung porös‐struktureller Funktionalität für Anwendungen in Speicherungs‐, Austausch‐, Trennprozessen etc. und 3) porös‐strukturelle Funktionalität auf der Basis dynamischer Kristallumwandlungen durch Gastmoleküle oder physikalische Reize. Ziel ist es, den aktuellen Stand der Forschung zur Chemie und Physik von und in den Mikroporen poröser Koordinationspolymere vorzustellen.

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Section: Schichten (2d-räume)unclassified

Funktionale poröse Koordinationspolymere

2004

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“…[25,26] Other known flexible zeolites display this flexibility in other ways, including reversible shrinking of the framework upon solvent removal (e.g. for zeolite Na-MAP [27] and germanate ASU-16 [28] ), temperature-triggered phase transitions (e.g. in zeolite Sr-RHO [29] ) as well as framework displacement upon cation exchange (as in zeolites Ca,H-RHO, Sr-RHO, Ba-RHO, Cd-RHO and Na,Cs-RHO [30] ).…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Methods and Models to Study Flexible Metal–Organic Frameworks

et al. 2011

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Much attention has recently been focused on a fascinating subclass of metal-organic frameworks that behave in a remarkable stimuli-responsive fashion. These soft porous crystals feature dynamic crystalline frameworks displaying reversible, large-amplitude structural deformations under external physical constraints such as temperature, electric field or gas exposure. The number of reported syntheses of such materials is rapidly growing and they are promising for practical applications, such as gas capture, purification and fluid separation. Herein, we summarize the recently developed thermodynamic tools that can help understand the process of fluid adsorption and fluid mixture coadsorption in these flexible nanoporous materials. These tools, which include both molecular simulation methods and analytical models, can help rationalize experimental results and predict adsorption properties over a wide range of thermodynamic conditions. A particular focus is given on how these methods can guide the experimental exploration of a large number of materials and working conditions (temperature, pressure, composition) to help design efficient processes relying on fluid adsorption in soft porous crystals.

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“…The framework density is 9.7 T per 1000 3 (T = tetrahedrally coordinated atoms, that is, Zn or P), which is one of the lowest values known for open-framework materials. [21][22][23][24][25][26][27][28] The framework of 1 consists solely of 12-membered rings. Each tetrahedrally coordinated Zn atom is associated with six 12-rings.…”

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confidence: 99%

[{Zn₂(HPO₄)₄}{Co(dien)₂}]⋅H₃O: A Zinc Phosphate with Multidirectional Intersecting Helical Channels

et al. 2003

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Chiral inorganic materials with helical pores are particularly desirable because of their promising applications in enantioselective catalysis and separation. It is recognized that both zeolite beta [1, 2] and are heavily intergrown, with one of the polymorphs being chiral. However, an optically pure chiral zeolite material has been never found. [8] UCSB-7 frameworks contain cross-linked helical pores, [9] and metal borophosphates contain 6 1 or 6 5 helices.[10]Recently, we reported the layered zinc phosphite [(C 5 H 6 N 2 )Zn(HPO 3 )], which consists of left-handed and right-handed helical chains. The guest templating molecules are found to be important for the formation of the helical -Zn-O-P-chains.[11]Employing chiral metal complexs as templating agents has proven to be a possible approach to induce a chiral environment in the host framework.[12] Several metal phosphates templated by an optically pure or a racemic mixture of chiral metal complexes have been reported, including aluminophosphates, [12][13][14][15][16]

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A Flexible Germanate Structure Containing 24-Ring Channels and with Very Low Framework Density

Cited by 162 publications

References 16 publications

Funktionale poröse Koordinationspolymere

Funktionale poröse Koordinationspolymere

Thermodynamic Methods and Models to Study Flexible Metal–Organic Frameworks

[{Zn₂(HPO₄)₄}{Co(dien)₂}]⋅H₃O: A Zinc Phosphate with Multidirectional Intersecting Helical Channels

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A Flexible Germanate Structure Containing 24-Ring Channels and with Very Low Framework Density

Cited by 162 publications

References 16 publications

Funktionale poröse Koordinationspolymere

Funktionale poröse Koordinationspolymere

Thermodynamic Methods and Models to Study Flexible Metal–Organic Frameworks

[{Zn2(HPO4)4}{Co(dien)2}]⋅H3O: A Zinc Phosphate with Multidirectional Intersecting Helical Channels

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[{Zn₂(HPO₄)₄}{Co(dien)₂}]⋅H₃O: A Zinc Phosphate with Multidirectional Intersecting Helical Channels