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Harvey-Reid NC, Sensharma D, Mukherjee S, Patil KM, Kumar N, Nikkhah SJ, Vandichel M, Zaworotko MJ, Kruger PE. Crystal Engineering of a New Hexafluorogermanate Pillared Hybrid Ultramicroporous Material Delivers Enhanced Acetylene Selectivity. ACS APPLIED MATERIALS & INTERFACES 2024; 16:4803-4810. [PMID: 38258417 DOI: 10.1021/acsami.3c16634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
Hybrid ultramicroporous materials (HUMs), metal-organic platforms that incorporate inorganic pillars, are a promising class of porous solids. A key area of interest for such materials is gas separation, where HUMs have already established benchmark performances. Thanks to their ready compositional modularity, we report the design and synthesis of a new HUM, GEFSIX-21-Cu, incorporating the ligand pypz (4-(3,5-dimethyl-1H-pyrazol-4-yl)pyridine, 21) and GeF62- pillaring anions. GEFSIX-21-Cu delivers on two fronts: first, it displays an exceptionally high C2H2 adsorption capacity (≥5 mmol g-1) which is paired with low uptake of CO2 (<2 mmol g-1), and, second, a low enthalpy of adsorption for C2H2 (ca. 32 kJ mol-1). This combination is rarely seen in the C2H2 selective physisorbents reported thus far, and not observed in related isostructural HUMs featuring pypz and other pillaring anions. Dynamic column breakthrough experiments for 1:1 and 2:1 C2H2/CO2 mixtures revealed GEFSIX-21-Cu to selectively separate C2H2 from CO2, yielding ≥99.99% CO2 effluent purities. Temperature-programmed desorption experiments revealed full sorbent regeneration in <35 min at 60 °C, reinforcing HUMs as potentially technologically relevant materials for strategic gas separations.
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Affiliation(s)
- Nathan C Harvey-Reid
- MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Physical and Chemical Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
| | - Debobroto Sensharma
- Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Soumya Mukherjee
- Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Komal M Patil
- MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Physical and Chemical Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
| | - Naveen Kumar
- Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Sousa Javan Nikkhah
- Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Matthias Vandichel
- Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Michael J Zaworotko
- Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland
| | - Paul E Kruger
- MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Physical and Chemical Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
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Li X, Bian H, Huang W, Yan B, Wang X, Zhu B. A review on anion-pillared metal–organic frameworks (APMOFs) and their composites with the balance of adsorption capacity and separation selectivity for efficient gas separation. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214714] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Swarbrook AM, Weekes RJ, Goodwin JW, Hawes CS. Ligand isomerism fine-tunes structure and stability in zinc complexes of fused pyrazolopyridines. Dalton Trans 2021; 51:1056-1069. [PMID: 34935828 DOI: 10.1039/d1dt04007c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fused-ring pyrazoles offer a versatile platform for derivitization to give finely tuned and functional ligands in coordination assemblies. Here, we explore the pyrazolo[4,3-b]pyridine (HL1) and pyrazolo[3,4-c]pyridine (HL2) backbones and their N-substituted derivatives, using their coordination chemistry with zinc(II) in the solid state and in solution to examine the steric and electronic effects of varying their substitution pattern. The parent heterocycles HL1 and HL2 both generate robust and permanently porous isomeric MOFs on reaction with zinc and a dicarboxylate co-ligand. The subtle geometric change offered by the position of the backbone pyridyl nitrogen atom leads to substantial changes in the pore size and total pore volume, which is reflected in both their surface areas and CO2 uptake performance. Both materials are also unusually resilient to atmospheric water vapour by virtue of the strong metal-azolate bonding. The isomeric chelating ligands L3-L6, generated by N-arylation of the parent heterocycles with a 2-pyridyl group, each coordinate to zinc to give either mononuclear or polymeric coordination compounds depending on the involvement of the backbone pyridine nitrogen atom. While crystal packing influences based on the steric preferences of the ligands are dominant in the crystalline phase, fluorescence spectroscopy is used to show that the 2H isomers L4 and L6 show distinct coordination behaviour to the 1H isomers L3 and L5, forming competing [ML] and [ML2] species in soution. The first stability constant for L6 with zinc(II) is an order of magnitude larger than for the other three ligands, suggesting an improved binding strength based on the electron configuration in this isomer. These results show that careful control of remote substitution on fused pyrazole ligands can lead to substantial improvements in the stability of the resulting complexes, with consequences for the design of stable coordination assemblies containining labile metal ions.
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Affiliation(s)
- Amelia M Swarbrook
- School of Chemical and Physical Sciences, Keele University, Keele ST5 5BG, UK.
| | - Rohan J Weekes
- School of Chemical and Physical Sciences, Keele University, Keele ST5 5BG, UK.
| | - Jack W Goodwin
- School of Chemical and Physical Sciences, Keele University, Keele ST5 5BG, UK.
| | - Chris S Hawes
- School of Chemical and Physical Sciences, Keele University, Keele ST5 5BG, UK.
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Healy C, Harvey-Reid NC, Howard BI, Kruger PE. Thermal decomposition of hybrid ultramicroporous materials (HUMs). Dalton Trans 2020; 49:17433-17439. [PMID: 33226039 DOI: 10.1039/d0dt03852k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Hybrid Ultramicroporous Materials (HUMs) are porous coordination materials with exemplary gas sorption and separation characteristics, but relatively poor thermal stability when compared to other porous coordination polymers or metal-organic frameworks (MOFs). The origin of this poor thermal stability has not yet been experimentally verified. Therefore, we investigate the thermal decomposition mechanisms of representative HUMs with the general formulae [M(SiF6)(L)2] or [M(SiF6)(L)(H2O)2], where M = Ni(ii), Cu(ii) or Zn(ii) and L = pyrazine or 4,4'-bipyridine. We find that two decomposition mechanisms dominate: (i) the fragmentation of the XF62- pillar into gaseous XF4 and fluoride, and (ii) direct sublimation of the N-donor ligand. The former process dictates the overall thermal stability of the material. We also demonstrate that HF is a possible decomposition product from certain hydrated HUM materials.
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Affiliation(s)
- Colm Healy
- MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Physical and Chemical Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand.
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Healy C, Patil KM, Wilson BH, Hermanspahn L, Harvey-Reid NC, Howard BI, Kleinjan C, Kolien J, Payet F, Telfer SG, Kruger PE, Bennett TD. The thermal stability of metal-organic frameworks. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213388] [Citation(s) in RCA: 89] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Millan S, Makhloufi G, Janiak C. Metal-4,4′-azobis(3,5-dimethyl-1H-pyrazole) Complexes with Seven- and Nine-membered Hydrogen-bonded Rings Originating from the Pyrrolic NH Function. Z Anorg Allg Chem 2019. [DOI: 10.1002/zaac.201900052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Simon Millan
- Institut für Anorganische Chemie und Strukturchemie; Heinrich-Heine Universität Düsseldorf; 40204 Düsseldorf Germany
| | - Gamall Makhloufi
- Institut für Anorganische Chemie und Strukturchemie; Heinrich-Heine Universität Düsseldorf; 40204 Düsseldorf Germany
| | - Christoph Janiak
- Institut für Anorganische Chemie und Strukturchemie; Heinrich-Heine Universität Düsseldorf; 40204 Düsseldorf Germany
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Wilson BH, Scott HS, Qazvini OT, Telfer SG, Mathonière C, Clérac R, Kruger PE. A supramolecular porous material comprising Fe(ii) mesocates. Chem Commun (Camb) 2018; 54:13391-13394. [DOI: 10.1039/c8cc07227b] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The dinuclear mesocate [Fe2L3](BF4)4 is a supramolecular building block for a microporous material possessing 1D channels that are permanently accessible to incoming guest molecules showing a high selectivity for CO2 over N2.
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Affiliation(s)
- Benjamin H. Wilson
- MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Physical and Chemical Sciences
- University of Canterbury
- Christchurch 8041
- New Zealand
| | - Hayley S. Scott
- MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Physical and Chemical Sciences
- University of Canterbury
- Christchurch 8041
- New Zealand
| | - Omid T. Qazvini
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Institute of Fundamental Sciences
- Massey University
- Palmerston North 4442
- New Zealand
| | - Shane G. Telfer
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Institute of Fundamental Sciences
- Massey University
- Palmerston North 4442
- New Zealand
| | | | | | - Paul E. Kruger
- MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Physical and Chemical Sciences
- University of Canterbury
- Christchurch 8041
- New Zealand
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