C. Michael McGuirk's research while affiliated with Colorado School of Mines and other places

Publications (33)

Article
Step-shaped adsorption-desorption of gaseous payloads by flexible metal-organic frameworks can facilitate the delivery of large usable capacities with significantly reduced energetic penalties. This is desirable for the storage, transport, and delivery of H2, as prototypical adsorbents require large swings in pressure and temperature to achieve usa...
Article
Through systematic linker substitution in a flexible zeolitic imidazolate framework (ZIF) with step-shaped adsorption-desorption, structural intermediates between the known open and closed phases were isolated. Reflecting this, modulative sorption behaviour with an inverting adsorption pressure trend-in which the step pressure decreases and then in...
Article
Research on permanently porous nanomaterials has gripped the attention of materials chemists for decades. Mesoporous silica nanoparticles (MSNs) and metal-organic frameworks (MOFs) are two of the most studied classes of materials in this field. Recently, explorations into embedding MOFs within the mesopores of MSNs have aimed to create composites t...
Article
Full-text available
Hydrogen induced flexibility in MOFs can be leveraged to increase useable gas storage capacities. Here hydrogen adsorption isothermal and in situ powder neutron diffraction measurements combine to reveal the mechanism driving flexibility in ZIF-7.
Article
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 8.0px Helvetica} span.s1 {font: 5.0px Helvetica} A series of structurally diverse alcoholamine‐ and alkoxyalkylamine‐functionalized variants of the metal–organic framework Mg 2 (dobpdc) are shown to adsorb CO 2 selectively via cooperative chain‐forming mechanisms. Solid‐state NMR spectra and optimized st...
Article
Kooperative CO2‐Chemisorption wurde in einem mit strukturell diversen Alkoholaminen und Alkoxyalkylaminen funktionalisierten Metall‐organischen Gerüst erreicht. Festkörper‐NMR‐Spektroskopie und DFT‐Berechnungen zeigen, dass CO2‐Adsorption über die Bildung und Übertragung von wasserstoffbrückenstabilisierter Carbamidsäure oder Ammoniumcarbamat‐Struk...
Article
Full-text available
Over one million tons of CS2 are produced annually, and emissions of this volatile and toxic liquid, known to generate acid rain, remain poorly controlled. As such, materials capable of reversibly capturing this commodity chemical in an energy-efficient manner are of interest. Recently, we detailed diamine-appended metal–organic frameworks capable...
Article
Metal-organic frameworks that display step-shaped adsorption profiles arising from discrete pressure-induced phase changes are promising materials for applications in both high-capacity gas storage and energy-efficient gas separations. The thorough investigation of such materials through chemical diversification, gas adsorption measurements, and in...
Preprint
p>Over one million tons of carbon disulfide are produced globally each year for an array of applications, and emissions of this highly volatile and toxic liquid, known to generate acid rain, remain poorly controlled. As such, materials capable of reversibly capturing this commodity chemical in an energy-efficient manner are of interest. Recently, w...
Preprint
p>Metal–organic frameworks that display step-shaped adsorption profiles arising from discrete pressure-induced phase changes are promising materials for applications in both high-capacity gas storage and energy-efficient gas separations. The thorough investigation of such materials through chemical diversification, gas adsorption measurements, and...
Article
Due to their well‐defined 3D architectures, permanent porosity, and diverse chemical functionalities, metal–organic framework nanoparticles (MOF NPs) are an emerging class of modular nanomaterials. Herein, recent developments in the synthesis and postsynthetic surface functionalization of MOF NPs that strengthen the fundamental understanding of how...
Article
A new allosterically regulated, four-state macrocycle bearing hemilabile ligands can be assembled via the weak-link approach. The macrocycle can access four distinct states upon the introduction or removal of elemental anions or small-molecule effectors. This allosteric, four-state system may be used in the construction of stimuli-responsive archit...
Article
Full-text available
Metal-organic frameworks (MOFs) are a class of modular, crystalline, and porous materials that hold promise for storage and transport of chemical cargoes. Though MOFs have been studied in bulk forms, ways of deliberately manipulating the external surface functionality of MOF nanoparticles are less developed. A generalizable approach to modify their...
Article
Full-text available
Herein, we report the reversible in situ "on-off" allosteric regulation of hydrogen-bond-donating (HBD)-Lewis base co-catalytic activity via a concerted two-prong methodology entailing cooperative acid-base chemistry and a structurally addressable coordination complex. Specifically, a heteroligated Pt(ii) weak-link approach (WLA) tweezer complex co...
Article
Herein, we report the first allosteric photoredox catalyst regulated via constructively coupled structural and electronic control. While often synergistically exploited in nature, these two types of control mechanisms have only been applied independently in the vast majority of allosteric enzyme mimics and receptors in the literature. By embedding...
Article
Full-text available
Recently, Ag-Ag2S hybrid nanostructures have attracted a great deal of attention due to their enhanced chemical and thermal stability, in addition to their morphology- and composition-dependent tunable local surface plasmon resonances. Although Ag-Ag2S nanostructures can be synthesized via sulfidation of as-prepared anisotropic Ag nanoparticles, th...
Article
A method for modifying the external surfaces of a series of nanoscale metal-organic frameworks (MOFs) with 1,2-dioleoyl-sn-glycero-3-phosphate (DOPA) is presented. A series of zirconium-based nanoMOFs of the same topology (UiO-66, UiO-67, and BUT-30) were synthesized, isolated as aggregates, and then conjugated with DOPA to create stably dispersed...
Article
Coordination chemistry is regularly used to generate supramolecular constructs with unique environments around embedded components to affect their intrinsic properties. In certain cases, it can also be used to effect changes in supramolecular structure reminiscent of those that occur within stimuli-responsive biological structures, such as alloster...
Article
Full-text available
Biological photosynthetic machinery allosterically regulate light harvesting via conformational and electronic changes at the antenna protein complexes as a response to specific chemical inputs. Fundamental limitations in current approaches to regulating inorganic light-harvesting mimics prevent their use in catalysis. Here we show that a light-har...
Article
Herein, we demonstrate that the incorporation of an acidic hydrogen-bond-donating squaramide moiety into a porous UiO-67 metal-organic framework (MOF) derivative leads to dramatic acceleration of the biorelevant Friedel-Crafts reaction between indole and β-nitrostyrene. In comparison, it is shown that free squaramide derivatives, not incorporated i...
Article
Herein, we demonstrate that the activity of a hydrogen-bond-donating (HBD) catalyst embedded within a coordination framework can be allosterically regulated in situ by controlling oligomerization via simple changes in coordination chemistry at distal Pt(II) nodes. Using the halide-induced ligand rearrangement reaction (HILR), a heteroligated Pt(II)...
Article
The ability of Rh(i) centers to undergo photoinduced electron transfer from discrete metal orbitals to Bodipy fluorophores is mediated through reversible coordination chemistry.
Article
Herein, we report the synthesis and characterization of the first weak-link approach (WLA) supramolecular construct that employs the small molecule regulation of intermolecular hydrogen bonding interactions for the in situ control of catalytic activity. A biaryl urea group, prone to self-aggregation, was functionalized with a phosphinoalkyl thioeth...
Article
Air-stable, heteroligated platinum(II) weak-link approach (WLA) tweezer and triple-layer complexes that possess P,X-Aryl hemilabile ligands (P^ = Ph2PCH2CH2-, X = chalcoethers or amines) have been synthesized via the halide-induced ligand rearrangement (HILR) reaction, using a one-pot, partial chloride-abstraction method. The approach is general an...

Citations

... [24] As a result, TH5α-acetone has 3D interconnected porosity, unlike other triptycene-based molecules that have been reported to form hexagonally-packed 1D channels, such as the trisbenzimidazolone T2-γ, [14] trisimidazole FDM-15, [36] and chalcogen-bonded organic framework Trip3Sez. [37] While other triptycene-based HOFs with 3D pores have been reported, those hydrogen-bonded networks have tended to interpenetrate. [20] Hence, TH5α-acetone is a rare example of a non-interpenetrated triptycene-based HOF that features interconnected 3D porosity. ...
... a PXRD patterns of as synthesized and activated ZIF-7 and ZIF-9 nanocrystals. Tick marks represent the characteristic Bragg reflection positions of ZIF-7 np phase (dark blue)61 and lp phase (light blue)23 . b TEM images of ZIF-7 and ZIF-9 nanocrystal aggregates. ...
... Due to their appealing properties such as structural and functional diversity, porous nature, size tunability, and enormous surface area. MOF is an attractive candidate for their potential applications in gas storage, [37][38][39][40][41][42] molecular separation, 40,[43][44][45][46][47][48][49][50] sensors, [51][52][53][54][55][56] and catalysis [57][58][59][60][61][62][63][64] among all other classical sorbent systems. The balance between the high gravimetric and volumetric adsorptive capacity of MOF makes them undeniably, a promising class of material for adsorptive gas storage application, apart from zeolites, COFs, and complex hydrides that are available for gas adsorption applications. ...
... Solid adsorbents such as amine-functionalized porous (Pacheco et al. 2022)、zeolite (Cañada-Barcala et al. 2023)、carbon (Li et al. 2023;Otgonbayar et al. 2022) and metal-organic frameworks (MOFs) (Ding et al. 2019;Mao et al. 2020) have been widely investigated. Among these adsorbents, amine-functionalized adsorbents have been explored the most thoroughly for post-synthesis CO 2 collection because they can successfully adsorb low concentrations of CO 2 from air including water vapor (Mason et al. 2015). ...
... After adsorption, if happened with carbon disulfide, the presence of a disulfide group in both zinc and carbon materials enhances their biodegradability and lowers their toxicity (Li et al. 2014;Onwudiwe et al. 2016;Martín et al. 2019;Saiyed et al. 2021). • The adsorbent under investigation could be regenerated by heating (~ 100 ℃) under a flow of nitrogen, under a flow of steam, or boiling water (Yang et al. 2006;Wang et al. 2015;McGuirk et al. 2018). • Even though the spent adsorbent is becoming inactive, it can be treated properly and optimized to produce a valuable product such as biogas (Chen et al. 2020;Wang et al. 2021b. ...
... For the proof of concept outlined here, the isostructural MOF materials ZIF-7 and ZIF-9 were selected for the formulation of responsive type 3 PLs 23 . Both frameworks feature the same sod (sodalite) topology, and are known to undergo a phase transition from a nearly non-porous np phase to a porous lp phase (Fig. 2a) upon the adsorption of various gases (for example CO 2 and different hydrocarbons), and further fulfill the other requirements for the preparation of responsive PLs given above [35][36][37][38] . Moreover, the previous study by Lai et al. already demonstrated that at least ZIF-7 is a suitable material for the development of breathing PLs 13 . ...
... ii) Shape. According to Wang et al. (2018), nanoparticles may have three dimensions, such as nanospheres, nanocubes, nanostars, and nanoprism; two dimensions, such as graphene layers; one dimension, such as nanotubes and; zero dimension, such as dots-shaped nanoparticles. iii) Type of material. ...
... Allosteric regulation is widely encountered in natural systems, and many artificial host-guest systems displaying allosteric binding have been investigated in the literature in order to better understand these processes. [22,[43][44][45][46][47][48][49] Along our efforts to develop porphyrin double cage compounds, we previously reported on H 2 2 (Figure 1) in which a porphyrin molecule is featured to which two glycoluril cages are attached via 8 covalent bonds. [50,51] This host was found to bind two viologen guests via negative allosteric cooperativity, i. e., the second viologen was bound more than 3 orders of magnitude weaker than the first. ...
... For instance, ZIF-8 and amine-synthesised UiO-66 along with CpG oligonucleotides have been used for studying DNA-MOF interactions [18] . Oligonucleotides have also been loaded onto Zr and Fe-based MOFs [19] . However, most of the reports utilized short-chain DNA sequences which are significantly different from functional genes suitable for gene therapy. ...
... With the advent of the halideinduced ligand rearrangement reaction, 14,15 it is now possible to make WLA complexes with two different hemilabile ligands, providing the ability to synthesize complexes with asymmetric reaction sites, complex recognition pockets, and more sophisticated architectural parameters and reactivities. 16,17 The stimuliresponsive properties of these assemblies render the WLA an emerging and important tool for preparing allosterically addressable supramolecular constructs that mimic enzymes. 18−21 Typically, WLA complexes are assembled from d 8 transition metals (such as Rh I and Pt II ) and hemilabile bidentate phosphino−chalcoether (P,X; X = O, S, Se) ligands. ...