76
|
Guo Y, Elliott C, McNulty JA, Cordes DB, Slawin AMZ, Lightfoot P. New Variants of (110)‐Oriented Layered Lead Bromide Perovskites, Templated by Formamidinium or Pyrazolium. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
77
|
Clark JL, Neyyappadath RM, Yu C, Slawin AMZ, Cordes DB, O'Hagan D. Janus All-Cis 2,3,4,5,6-Pentafluorocyclohexyl Building Blocks Applied to Medicinal Chemistry and Bioactives Discovery Chemistry. Chemistry 2021; 27:16000-16005. [PMID: 34486192 PMCID: PMC9292521 DOI: 10.1002/chem.202102819] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Indexed: 12/24/2022]
Abstract
Monoalkylated derivatives of the unusually polar all‐cis 2,3,4,5,6‐ pentafluorocyclohexyl (Janus face) motif are prepared starting from an aryl hydrogenation of 2,3,4,5,6‐ pentafluorophenylacetate methyl ester 15. The method used Zeng's Rh(CAAC) carbene catalyst 4 in the hydrogenation following the protocol developed by Glorius. The resultant Janus pentafluorocyclohexylacetate methyl ester 16 was converted to the corresponding alcohol 18, aldehyde 13, bromide 29 and azide 14 through functional group manipulations, and some of these building blocks were used in Ugi‐multicomponent and Cu‐catalysed click reactions. NBoc protected pentafluoroarylphenylalanine methyl ester 35 was also subject to an aryl hydrogenation, and then deprotection to generate the Janus face β‐pentafluorocyclohexyl‐alanine amino acid 15, which was incorporated into representative members of an emerging class of candidate antiviral compounds. Log P measurements demonstrate that the all‐cis 2,3,4,5,6‐pentafluorocyclohexyl ring system is more polar than a phenyl ring. In overview the paper introduces new building blocks containing this Janus ring and demonstrates their progression to molecules typically used in bioactives discovery programmes.
Collapse
|
78
|
Mackenzie CFR, Delforce L, Rota Martir D, Cordes DB, Slawin AMZ, Zysman-Colman E. A Luminescent 1D Silver Polymer Containing [2.2]Paracyclophane Ligands. Front Chem 2021; 9:728845. [PMID: 34422772 PMCID: PMC8371969 DOI: 10.3389/fchem.2021.728845] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 07/12/2021] [Indexed: 11/14/2022] Open
Abstract
[2.2]Paracyclophane scaffolds have seen limited use as building blocks in supramolecular chemistry. Here, we report the synthesis and characterization of a 1D coordination polymer consisting of silver(I) ions bound to a [2.2]paracyclophane scaffold functionalized with two 4-pyridyl units. The structure of the polymer has been determined from single crystal X-ray diffraction analysis and reveals two different silver coordination motifs that alternate along the 1D coordination polymer. The coordination polymer exhibits strong blue and sky-blue fluorescence in solution and in the crystalline solid state, respectively.
Collapse
|
79
|
Tian J, Cordes DB, Slawin AMZ, Zysman-Colman E, Morrison FD. Progressive Polytypism and Bandgap Tuning in Azetidinium Lead Halide Perovskites. Inorg Chem 2021; 60:12247-12254. [PMID: 34319709 DOI: 10.1021/acs.inorgchem.1c01425] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mixed halide azetidinium lead perovskites AzPbBr3-xXx (X = Cl or I) were obtained by mechanosynthesis. With varying halide composition from Cl- to Br- to I-, the chloride and bromide analogues both form in the hexagonal 6H polytype while the iodide adopts the 9R polytype. An intermediate 4H polytype is observed for mixed Br/I compositions. Overall, the structure progresses from 6H to 4H to 9R perovskite polytype with varying halide composition. Rietveld refinement of the powder X-ray diffraction patterns revealed a linear variation in unit cell volume as a function of the average radius of the anion, which not only is observed within the solid solution of each polytype (according to Vegard's law) but also extends uniformly across all three polytypes. This is correlated to a progressive (linear) tuning of the bandgap from 3.43 to 2.00 eV. Regardless of halide, the family of azetidinium halide perovskite polytypes are highly stable, with no discernible change in properties over more than 6 months under ambient conditions.
Collapse
|
80
|
Clark JL, Taylor A, Geddis A, Neyyappadath RM, Piscelli BA, Yu C, Cordes DB, Slawin AMZ, Cormanich RA, Guldin S, O'Hagan D. Supramolecular packing of alkyl substituted Janus face all- cis 2,3,4,5,6-pentafluorocyclohexyl motifs. Chem Sci 2021; 12:9712-9719. [PMID: 34349942 PMCID: PMC8293821 DOI: 10.1039/d1sc02130c] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 06/04/2021] [Indexed: 02/04/2023] Open
Abstract
This study uses X-ray crystallography, theory and Langmuir isotherm analysis to explore the conformations and molecular packing of alkyl all-cis 2,3,4,5,6-pentafluorocyclohexyl motifs, which are prepared by direct aryl hydrogenations from alkyl- or vinyl-pentafluoroaryl benzenes. Favoured conformations retain the more polar triaxial C-F bond arrangement of the all-cis 2,3,4,5,6-pentafluorocyclohexyl ring systems with the alkyl substituent adopting an equatorial orientation, and accommodating strong supramolecular interactions between rings. Langmuir isotherm analysis on a water subphase of a long chain fatty acid and alcohol carrying terminal all-cis 2,3,4,5,6-pentafluorocyclohexyl rings do not show any indication of monolayer assembly relative to their cyclohexane analogues, instead the molecules appear to aggregate and form higher molecular assemblies prior to compression. The study indicates the power and potential of this ring system as a motif for ordering supramolecular assembly.
Collapse
|
81
|
Chauhan RS, Nagar S, Chatterjee S, Goswami D, Cordes DB, Slawin AMZ, Tawde T. Synthesis of Palladium complexes derived from Amido linked N‐Heterocyclic Carbenes and their use in Suzuki cross coupling reactions. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
82
|
Han C, Bradford AJ, Slawin AMZ, Bode BE, Fusco E, Lee SL, Tang CC, Lightfoot P. Structural Features in Some Layered Hybrid Copper Chloride Perovskites: ACuCl 4 or A 2CuCl 4. Inorg Chem 2021; 60:11014-11024. [PMID: 34242021 DOI: 10.1021/acs.inorgchem.1c00705] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present three new hybrid copper(II) chloride layered perovskites of generic composition ACuCl4 or A2CuCl4, which exhibit three distinct structure types. (m-PdH2)CuCl4 (m-PdH22+ = protonated m-phenylenediamine) adopts a Dion-Jacobson (DJ)-like layered perovskite structure type and exhibits a very large axial thermal contraction effect upon heating, as revealed via variable-temperature synchrotron X-ray powder diffraction (SXRD). This can be attributed to the contraction of an interlayer block, via a slight repositioning of the m-PdH22+ moiety. (3-AbaH)2CuCl4 (3-AbaH+ = protonated 3-aminobenzoic acid) and (4-AbaH)2CuCl4 (4-AbaH+ = protonated 4-aminobenzoic acid) possess the same generic formula as Ruddlesden-Popper (RP) layered perovskites, A2BX4, but adopt different structures. (4-AbaH)2CuCl4 adopts a near-staggered structure type, whereas (3-AbaH)2CuCl4 adopts a near-eclipsed structure type, which resembles the DJ rather than the RP family. (3-AbaH)2CuCl4 also displays static disorder of the [CuCl4]∞ layers. The crystal structures of each are discussed in terms of the differing nature of the templating molecular species, and these are compared to related layered perovskites. Preliminary magnetic measurements are reported, suggesting dominant ferromagnetic interactions.
Collapse
|
83
|
Abazari R, Yazdani E, Nadafan M, Kirillov AM, Gao J, Slawin AMZ, Carpenter-Warren CL. Third-Order Nonlinear Optical Behavior of an Amide-Tricarboxylate Zinc(II) Metal-Organic Framework with Two-Fold 3D+3D Interpenetration. Inorg Chem 2021; 60:9700-9708. [PMID: 34120443 DOI: 10.1021/acs.inorgchem.1c00997] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A new metal-organic framework (MOF), [Zn4(μ4-O)(μ6-L)2(H2O)2]n·nDMF (ZSTU-10), was assembled from zinc(II) nitrate and N,N',N″-bis(4-carboxylate)trimesicamide linkers and fully characterized. Its crystal structure discloses an intricate two-fold 3D+3D interpenetrated MOF driven by the [Zn4(μ4-O)]-based tetragonal secondary building units and the C3-symmetric tris-amide-tricarboxylate linkers (μ6-L3-). Topological analysis of ZSTU-10 reveals two interpenetrated 3,6-connected nets with an rtl (rutile) topology. Z-Scan analysis at 532 nm was conducted to study a nonlinear optical (NLO) behavior of ZSTU-10. The nonlinear responses of ZSTU-10 were explored under various laser intensities, revealing notable third-order NLO properties in the visible region. A large two-photon absorption at lower incident intensities highlights the fact that ZSTU-10 can be applied in optical limiting devices as well as optical modulators. Moreover, a nonlinear refractive index (n2) is indicative of a self-defocusing behavior. This work thus expands a family of novel MOF materials with remarkable optical properties.
Collapse
|
84
|
Li C, Mackenzie CFR, Said SA, Pal AK, Haghighatbin MA, Babaei A, Sessolo M, Cordes DB, Slawin AMZ, Kamer PCJ, Bolink HJ, Hogan CF, Zysman-Colman E. Wide-Bite-Angle Diphosphine Ligands in Thermally Activated Delayed Fluorescent Copper(I) Complexes: Impact on the Performance of Electroluminescence Applications. Inorg Chem 2021; 60:10323-10339. [PMID: 34197094 DOI: 10.1021/acs.inorgchem.1c00804] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report a series of seven cationic heteroleptic copper(I) complexes of the form [Cu(P^P)(dmphen)]BF4, where dmphen is 2,9-dimethyl-1,10-phenanthroline and P^P is a diphosphine chelate, in which the effect of the bite angle of the diphosphine ligand on the photophysical properties of the complexes was studied. Several of the complexes exhibit moderately high photoluminescence quantum yields in the solid state, with ΦPL of up to 35%, and in solution, with ΦPL of up to 98%. We were able to correlate the powder photoluminescence quantum yields with the % Vbur of the P^P ligand. The most emissive complexes were used to fabricate both organic light-emitting diodes and light-emitting electrochemical cells (LECs), both of which showed moderate performance. Compared to the benchmark copper(I)-based LECs, [Cu(dnbp)(DPEPhos)]+ (maximum external quantum efficiency, EQEmax = 16%), complex 3 (EQEmax = 1.85%) showed a much longer device lifetime (t1/2 = 1.25 h and >16.5 h for [Cu(dnbp)(DPEPhos)]+ and complex 3, respectively). The electrochemiluminescence (ECL) properties of several complexes were also studied, which, to the best of our knowledge, constitutes the first ECL study for heteroleptic copper(I) complexes. Notably, complexes exhibiting more reversible electrochemistry were associated with higher annihilation ECL as well as better performance in a LEC.
Collapse
|
85
|
McGeachie LJR, Bühl M, Cordes DB, Slawin AMZ, Woollins JD. Bridging (Thionylimido)metal Complexes. Inorg Chem 2021; 60:8423-8427. [PMID: 34043915 DOI: 10.1021/acs.inorgchem.1c00725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the first examples of the thionylimido ligand acting as a μ2-bridging ligand between two transition-metal centers; using Cp2Ti(NSO)2, we describe bi- and tetrametallic systems.
Collapse
|
86
|
Vanden Broeck SMP, Nelson DJ, Collado A, Falivene L, Cavallo L, Cordes DB, Slawin AMZ, Van Hecke K, Nahra F, Cazin CSJ, Nolan SP. Synthesis of Gold(I)-Trifluoromethyl Complexes and their Role in Generating Spectroscopic Evidence for a Gold(I)-Difluorocarbene Species. Chemistry 2021; 27:8461-8467. [PMID: 33822412 DOI: 10.1002/chem.202100195] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Indexed: 02/06/2023]
Abstract
Readily prepared and bench-stable [Au(CF3 )(NHC)] compounds were synthesized by using new methods, starting from [Au(OH)(NHC)], [Au(Cl)(NHC)] or [Au(L)(NHC)]HF2 precursors (NHC=N-heterocyclic carbene). The mechanism of formation of these species was investigated. Consequently, a new and straightforward strategy for the mild and selective cleavage of a single carbon/fluorine bond from [Au(CF3 )(NHC)] complexes was attempted and found to be reversible in the presence of an additional nucleophilic fluoride source. This straightforward technique has led to the unprecedented spectroscopic observation of a gold(I)-NHC difluorocarbene species.
Collapse
|
87
|
Zhao F, Shu C, Young CM, Carpenter‐Warren C, Slawin AMZ, Smith AD. Enantioselective Synthesis of α-Aryl-β 2 -Amino-Esters by Cooperative Isothiourea and Brønsted Acid Catalysis. Angew Chem Int Ed Engl 2021; 60:11892-11900. [PMID: 33646631 PMCID: PMC8252622 DOI: 10.1002/anie.202016220] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Indexed: 01/07/2023]
Abstract
The synthesis of α-aryl-β2 -amino esters through enantioselective aminomethylation of an arylacetic acid ester in high yields and enantioselectivity via cooperative isothiourea and Brønsted acid catalysis is demonstrated. The scope and limitations of this process are explored (25 examples, up to 94 % yield and 96:4 er), with applications to the synthesis of (S)-Venlafaxine⋅HCl and (S)-Nakinadine B. Mechanistic studies are consistent with a C(1)-ammonium enolate pathway being followed rather than an alternative dynamic kinetic resolution process. Control studies indicate that (i) a linear effect between catalyst and product er is observed; (ii) an acyl ammonium ion can be used as a precatalyst; (iii) reversible isothiourea addition to an in situ generated iminium ion leads to an off-cycle intermediate that can be used as a productive precatalyst.
Collapse
|
88
|
Zhao F, Shu C, Young CM, Carpenter‐Warren C, Slawin AMZ, Smith AD. Enantioselective Synthesis of α‐Aryl‐β
2
‐Amino‐Esters by Cooperative Isothiourea and Brønsted Acid Catalysis. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202016220] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
89
|
Hua G, Carpenter-Warren CL, Cordes DB, Slawin AMZ, Woollins JD. Synthesis and Single Crystal Structures of N-Substituted Benzamides and Their Chemoselective Selenation/Reduction Derivatives. Molecules 2021; 26:2367. [PMID: 33921716 PMCID: PMC8073290 DOI: 10.3390/molecules26082367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 04/06/2021] [Accepted: 04/15/2021] [Indexed: 11/17/2022] Open
Abstract
A series of N-aryl-N-(2-oxo-2-arylethyl) benzamides and cinnamides has been prepared. The reaction of the benzamides with Woollins' reagent, a highly efficient chemoselective selenation/reduction reagent, gave the corresponding N-aryl-N-(arylenethyl) benzoselenoamides in good yields. Five representative single crystal X-ray structures are discussed.
Collapse
|
90
|
Gupta AK, Li W, Ruseckas A, Lian C, Carpenter-Warren CL, Cordes DB, Slawin AMZ, Jacquemin D, Samuel IDW, Zysman-Colman E. Thermally Activated Delayed Fluorescence Emitters with Intramolecular Proton Transfer for High Luminance Solution-Processed Organic Light-Emitting Diodes. ACS APPLIED MATERIALS & INTERFACES 2021; 13:15459-15474. [PMID: 33783201 DOI: 10.1021/acsami.1c02248] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We report an organic emitter containing a β-triketone electron acceptor core and phenoxazine as the electron donors (TPXZBM) for solution-processed organic light-emitting diodes (OLEDs). The resulting molecule is very unusual because it shows both thermally activated delayed fluorescence and intramolecular proton transfer. We compare its performance with the previously reported diketone analogue PXZPDO. Solution-processed OLEDs of PXZPDO and TPXZBM show maximum external quantum efficiencies of 20.1 and 12.7%, respectively. The results obtained for the solution-processed PXZPDO-based device are as good as the previously reported evaporated device. At a very high luminance of 10,000 cd m-2, the efficiencies of the OLEDs were 10.6% for PXZPDO and 4.7% for TPXZBM, demonstrating a relatively low efficiency roll-off for TADF materials. The low efficiency roll-off was rationalized on the basis of the short delayed lifetimes of 1.35 μs for PXZPDO and 1.44 μs for TPXZBM. Our results suggest that intramolecular proton transfer may be useful for the design of OLED materials with a low efficiency roll-off.
Collapse
|
91
|
Bell NL, Xu C, Fyfe JWB, Vantourout JC, Brals J, Chabbra S, Bode BE, Cordes DB, Slawin AMZ, McGuire TM, Watson AJB. Cu(OTf)
2
‐Mediated Cross‐Coupling of Nitriles and N‐Heterocycles with Arylboronic Acids to Generate Nitrilium and Pyridinium Products**. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202016811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
92
|
Bell NL, Xu C, Fyfe JWB, Vantourout JC, Brals J, Chabbra S, Bode BE, Cordes DB, Slawin AMZ, McGuire TM, Watson AJB. Cu(OTf) 2 -Mediated Cross-Coupling of Nitriles and N-Heterocycles with Arylboronic Acids to Generate Nitrilium and Pyridinium Products*. Angew Chem Int Ed Engl 2021; 60:7935-7940. [PMID: 33449408 PMCID: PMC8048606 DOI: 10.1002/anie.202016811] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 01/14/2021] [Indexed: 12/25/2022]
Abstract
Metal-catalyzed C-N cross-coupling generally forms C-N bonds by reductive elimination from metal complexes bearing covalent C- and N-ligands. We have identified a Cu-mediated C-N cross-coupling that uses a dative N-ligand in the bond-forming event, which, in contrast to conventional methods, generates reactive cationic products. Mechanistic studies suggest the process operates via transmetalation of an aryl organoboron to a CuII complex bearing neutral N-ligands, such as nitriles or N-heterocycles. Subsequent generation of a putative CuIII complex enables the oxidative C-N coupling to take place, delivering nitrilium intermediates and pyridinium products. The reaction is general for a range of N(sp) and N(sp2 ) precursors and can be applied to drug synthesis and late-stage N-arylation, and the limitations in the methodology are mechanistically evidenced.
Collapse
|
93
|
Kumar S, Franca LG, Stavrou K, Crovini E, Cordes DB, Slawin AMZ, Monkman AP, Zysman-Colman E. Investigation of Intramolecular Through-Space Charge-Transfer States in Donor-Acceptor Charge-Transfer Systems. J Phys Chem Lett 2021; 12:2820-2830. [PMID: 33719455 PMCID: PMC8041366 DOI: 10.1021/acs.jpclett.1c00265] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 03/04/2021] [Indexed: 05/29/2023]
Abstract
Commonly, thermally activated delayed fluorescence (TADF) emitters present a twisted donor-acceptor structure. Here, electronic communication is mediated through-bond via π-conjugation between donor and acceptor groups. A second class of TADF emitters are those where electronic communication between donor and acceptor moieties is mediated through-space. In these through-space charge-transfer (TSCT) architectures, the donor and acceptor groups are disposed in a pseudocofacial orientation and linked via a bridging group that is typically an arene (or heteroarene). In most of these systems, there is no direct evidence that the TSCT is the dominant contributor to the communication between the donor and acceptor. Herein we investigate the interplay between through-bond localized excited (LE) and charge-transfer (CT) states and the TSCT in a rationally designed emitter, TPA-ace-TRZ, and a family of model compounds. From our photophysical studies, TSCT TADF in TPA-ace-TRZ is unambiguously confirmed and supported by theoretical modeling.
Collapse
|
94
|
Hua G, Cordes DB, Slawin AMZ, Woollins JD. Organo Phosphorus‐Sulfur‐Nitrogen Heterocycles from Thionation of Schiff Bases. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202000226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
95
|
Hockin BM, Mackenzie CFR, Cordes DB, Slawin AMZ, Robertson N, Zysman-Colman E. Physical and photophysical properties of a linear copper(I) complex of a bulky acenapthene-based NHC ligand. J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1871901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
96
|
Abazari R, Sanati S, Morsali A, Kirillov AM, Slawin AMZ, Carpenter-Warren CL. Simultaneous Presence of Open Metal Sites and Amine Groups on a 3D Dy(III)-Metal–Organic Framework Catalyst for Mild and Solvent-Free Conversion of CO2 to Cyclic Carbonates. Inorg Chem 2021; 60:2056-2067. [DOI: 10.1021/acs.inorgchem.0c03634] [Citation(s) in RCA: 67] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
|
97
|
Krotkus S, Matulaitis T, Diesing S, Copley G, Archer E, Keum C, Cordes DB, Slawin AMZ, Gather MC, Zysman-Colman E, Samuel IDW. Fast Delayed Emission in New Pyridazine-Based Compounds. Front Chem 2021; 8:572862. [PMID: 33490031 PMCID: PMC7817954 DOI: 10.3389/fchem.2020.572862] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 10/13/2020] [Indexed: 11/13/2022] Open
Abstract
Three novel donor-acceptor molecules comprising the underexplored pyridazine (Pydz) acceptor moiety have been synthesized and their structural, electrochemical and photophysical properties thoroughly characterized. Combining Pydz with two phenoxazine donor units linked via a phenyl bridge in a meta configuration (dPXZMePydz) leads to high reverse intersystem crossing rate k RISC = 3.9 · 106 s-1 and fast thermally activated delayed fluorescence (TADF) with <500 ns delayed emission lifetime. Efficient triplet harvesting via the TADF mechanism is demonstrated in OLEDs using dPXZMePydz as the emitter but does not occur for compounds bearing weaker donor units.
Collapse
|
98
|
Prasad RRR, Pleass C, Rigg AL, Cordes DB, Lozinska MM, Georgieva VM, Hoffmann F, Slawin AMZ, Wright PA. Isoreticular chemistry of scandium analogues of the multicomponent metal–organic framework MIL-142. CrystEngComm 2021. [DOI: 10.1039/d0ce01593h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
MIL-142(Sc) is prepared and the limits of the isoreticular substitution of each linker type are explored and characterised by single-crystal XRD.
Collapse
|
99
|
Aragoni MC, Caltagirone C, Lippolis V, Podda E, Slawin AMZ, Woollins JD, Pintus A, Arca M. Diradical Character of Neutral Heteroleptic Bis(1,2-dithiolene) Metal Complexes: Case Study of [Pd(Me 2timdt)(mnt)] (Me 2timdt = 1,3-Dimethyl-2,4,5-trithioxoimidazolidine; mnt 2- = 1,2-Dicyano-1,2-ethylenedithiolate). Inorg Chem 2020; 59:17385-17401. [PMID: 33185438 PMCID: PMC7735710 DOI: 10.1021/acs.inorgchem.0c02696] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
The reaction of the bis(1,2-dithiolene)
complex [Pd(Me2timdt)2] (1; Me2timdt•– = monoreduced 1,3-dimethyl-2,4,5-trithioxoimidazolidine)
with Br2 yielded the complex [Pd(Me2timdt)Br2] (2), which was reacted with Na2mnt
(mnt2– = 1,2-dicyano-1,2-ethylenedithiolate) to
give the
neutral mixed-ligand complex [Pd(Me2timdt)(mnt)] (3). Complex 3 shows an intense solvatochromic
near-infrared (NIR) absorption band falling between 955 nm in DMF
and 1060 nm in CHCl3 (ε = 10700 M–1 cm–1 in CHCl3). DFT calculations were
used to elucidate the electronic structure of complex 3 and to compare it with those of the corresponding homoleptic complexes 1 and [Pd(mnt)2] (4). An in-depth
comparison of calculated and experimental structural and vis–NIR
spectroscopic properties, supported by IEF-PCM TD-DFT and NBO calculations,
clearly points to a description of 3 as a dithione-dithiolato
complex. For the first time, a broken-symmetry (BS) procedure for
the evaluation of the singlet diradical character (DC) of heteroleptic
bis(1,2-dithiolene) complexes has been developed and applied to complex 3. The DC, predominant for 1 (nDC = 55.4%), provides a remarkable contribution
to the electronic structures of the ground states of both 3 and 4, showing a diradicaloid nature (nDC = 24.9% and 27.5%, respectively). The computational
approach developed here clearly shows that a rational design of the
DC of bis(1,2-ditiolene) metal complexes, and hence their linear and
nonlinear optical properties, can be achieved by a proper choice of
the 1,2-dithiolene ligands based on their electronic structure. The reaction of [Pd(Me2timdt)2] (1; Me2timdt•− = monoreduced
1,3-dimethyl-2,4,5-trithioxoimidazolidine) with Br2 yielded
[Pd(Me2timdt)Br2] (2), which was
reacted with Na2mnt (mnt2− = 1,2-dicyano-1,2-ethylenedithiolate)
to give [Pd(Me2timdt)(mnt)] (3), showing an
intense solvatochromic near-infrared (NIR) absorption band. The singlet
diradical character (DC), predominant for 1, provides
a remarkable contribution to the ground states of 3 and 4. A rational design of the DC of bis(1,2-dithiolene) complexes
can be achieved by a proper choice of the 1,2-dithiolene ligands.
Collapse
|
100
|
McNulty JA, Slawin AMZ, Lightfoot P. Variable dimensionality in 'hollow' hybrid tin iodide perovskites. Dalton Trans 2020; 49:15171-15174. [PMID: 33124631 DOI: 10.1039/d0dt03449e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Two 'hollow' B-site deficient perovskites, (TzH)11(H3PO2)Sn6I23 and (TzH)3Sn2I7 (TzH+ = 1,2,4-triazolium, H3PO2 = hypohosphorous acid), have been prepared. (TzH)11(H3PO2)Sn6I23 is the first example of a 2D layered structure of this type. Leaving the same reaction mixture for an extended time also affords the 3D derivative (TzH)3Sn2I7.
Collapse
|