Modulation of chiroptical and photophysical properties in helicenic rhenium(I) systems: the use of an N‐(aza[6]helicenyl)‐NHC ligand (2023)
Journal Article
Gauthier, E. S., Abella, L., Caytan, E., Roisnel, T., Vanthuyne, N., Favereau, L., …Crassous, J. (2023). Modulation of chiroptical and photophysical properties in helicenic rhenium(I) systems: the use of an N‐(aza[6]helicenyl)‐NHC ligand. Chemistry - A European Journal, 29(21), Article 202203477. https://doi.org/10.1002/chem.202203477

The photophysical and chiroptical properties of a novel, chiral helicene-NHC−Re(I) complex bearing an N-(aza[6]helicenyl)-benzimidazolylidene ligand are described, showing its ability to emit yellow circularly polarized luminescence. A comparative an... Read More about Modulation of chiroptical and photophysical properties in helicenic rhenium(I) systems: the use of an N‐(aza[6]helicenyl)‐NHC ligand.

Platinum(IV) Complexes with Tridentate, NNC-Coordinating Ligands: Synthesis, Structures, and Luminescence (2023)
Journal Article
Dikova, Y. M., Yufit, D. S., & Williams, J. G. (2023). Platinum(IV) Complexes with Tridentate, NNC-Coordinating Ligands: Synthesis, Structures, and Luminescence. Inorganic Chemistry, 62(4), 1306-1322. https://doi.org/10.1021/acs.inorgchem.2c04116

Platinum(II) complexes of NNC-cyclometalating ligands based on 6-phenyl-2,2′-bipyridine (HL1) have been widely investigated for their luminescence properties. We describe how PtL1Cl and five analogues with differently substituted aryl rings, PtL2–6Cl... Read More about Platinum(IV) Complexes with Tridentate, NNC-Coordinating Ligands: Synthesis, Structures, and Luminescence.

Near-infrared electroluminescence beyond 940 nm in Pt(N^C^N)X complexes: influencing aggregation with the ancillary ligand X (2022)
Journal Article
Salthouse, R. J., Pander, P., Yufit, D. S., Dias, F. B., & Williams, J. G. (2022). Near-infrared electroluminescence beyond 940 nm in Pt(N^C^N)X complexes: influencing aggregation with the ancillary ligand X. Chemical Science, 13(45), 13600-13610. https://doi.org/10.1039/d2sc05023d

We present a study of aggregate excited states formed by complexes of the type Pt(N^C^N)X, where N^C^N represents a tridentate cyclometallating ligand, and X = SCN or I. These materials display near-infrared (NIR) photoluminescence in film and electr... Read More about Near-infrared electroluminescence beyond 940 nm in Pt(N^C^N)X complexes: influencing aggregation with the ancillary ligand X.

Yellow-Emitting, Pseudo-Octahedral Zinc Complexes of Benzannulated N^N^O Pincer-Type Ligands (2022)
Journal Article
Lozada, I. B., Braun, J. D., Williams, J. G., & Herbert, D. E. (2022). Yellow-Emitting, Pseudo-Octahedral Zinc Complexes of Benzannulated N^N^O Pincer-Type Ligands. Inorganic Chemistry, 61(44), 17568-17578. https://doi.org/10.1021/acs.inorgchem.2c02585

A series of yellow-emitting, pseudo-octahedral Zn(II) complexes supported by monoanionic, tridentate acetylacetone-derived N^N–^O ligands incorporating phenanthridine (benzo[c]quinoline) units is presented. These species emit weakly in solution but e... Read More about Yellow-Emitting, Pseudo-Octahedral Zinc Complexes of Benzannulated N^N^O Pincer-Type Ligands.

Helicenic N-heterocyclic carbene copper(I) complex displaying circularly polarized blue fluorescence (2022)
Journal Article
Crassous, J., Gauthier, E. S., Kaczmarczyk, D., Fré, S. D., Favereau, L., Caytan, E., …Srebro-Hooper, M. (2022). Helicenic N-heterocyclic carbene copper(I) complex displaying circularly polarized blue fluorescence. Dalton Transactions, 51(40), 15571-15578. https://doi.org/10.1039/d2dt01925f

Enantiopure copper(I) chloride complexes bearing a monodentate N-(carbo[6]helicenyl)-NHC ligand have been prepared and characterized experimentally and computationally. Their high stability enables the stereochemistry to be probed by X-ray crystallog... Read More about Helicenic N-heterocyclic carbene copper(I) complex displaying circularly polarized blue fluorescence.

Synthesis and Coordination Chemistry of a Benzannulated Bipyridine: 6,6′-Biphenanthridine (2022)
Journal Article
Nemez, D. B., Lozada, I. B., Braun, J. D., Williams, J. G., & Herbert, D. E. (2022). Synthesis and Coordination Chemistry of a Benzannulated Bipyridine: 6,6′-Biphenanthridine. Inorganic Chemistry, 61(34), 13386-13398. https://doi.org/10.1021/acs.inorgchem.2c01514

The synthesis, characterization, and coordination chemistry of a doubly π-extended bipyridine analogue, 6,6′-biphenanthridine (biphe), is presented. The structure of the molecule has been determined in the solid state by X-ray diffraction, showing an... Read More about Synthesis and Coordination Chemistry of a Benzannulated Bipyridine: 6,6′-Biphenanthridine.

Excimer or aggregate? Near infrared electro- and photoluminescence from multimolecular excited states of N^C^N-coordinated platinum(ii) complexes (2022)
Journal Article
Pander, P., Sil, A., Salthouse, R. J., Harris, C. W., Walden, M. T., Yufit, D. S., …Dias, F. B. (2022). Excimer or aggregate? Near infrared electro- and photoluminescence from multimolecular excited states of N^C^N-coordinated platinum(ii) complexes. Journal of Materials Chemistry C Materials for optical and electronic devices, 10(40), 15084-15095. https://doi.org/10.1039/d2tc01511k

We present an experimental and theoretical study of aggregate excited states formed by complexes of the type Pt(N^C^N)Cl, which display near-infrared (NIR) photoluminescence in film and NIR electroluminescence in OLED devices. Here, N^C^N represents... Read More about Excimer or aggregate? Near infrared electro- and photoluminescence from multimolecular excited states of N^C^N-coordinated platinum(ii) complexes.

Synthesis, Mesomorphism, Photophysics, and Device Properties of Liquid-Crystalline Pincer Complexes of Gold(III) Containing Semiperfluorinated Chains (2022)
Journal Article
Parker, R. R., Stracey, R. F., McEllin, A. J., Chen, X., Wang, Y., Williams, J. G., …Bruce, D. W. (2022). Synthesis, Mesomorphism, Photophysics, and Device Properties of Liquid-Crystalline Pincer Complexes of Gold(III) Containing Semiperfluorinated Chains. ACS Omega, 7(28), 24903-24917. https://doi.org/10.1021/acsomega.2c03669

Gold(III) complexes of C∧N∧C-coordinating 2,6-diphenylpyridine pincer ligands with arylacetylide co-ligands are known triplet emitters at room temperature. We have reported previously that by functionalizing both the pincer ligand and the phenylacety... Read More about Synthesis, Mesomorphism, Photophysics, and Device Properties of Liquid-Crystalline Pincer Complexes of Gold(III) Containing Semiperfluorinated Chains.

Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors (2022)
Journal Article
Mullins, A. L., Ćirić, A., Zekovic, I., Williams, J. G., Dramicanin, M., & Evans, I. R. (2022). Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors. Journal of Materials Chemistry C Materials for optical and electronic devices, 10(28), 10396-10403. https://doi.org/10.1039/d2tc02011d

A series of La1-xGa0.99O3: Cr0.01, Ndx phosphors (where x = 0.005, 0.01, 0.02) for luminescence thermometry have been synthesised by a solid-state method, structurally characterised using powder X-ray diffraction data, and investigated by ambient and... Read More about Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors.

Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry (2022)
Journal Article
Mullins, A. L., Ćirić, A., Ristić, Z., Williams, J. G., Radosavljević Evans, I., & Dramićanin, M. D. (2022). Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry. Journal of Luminescence, 246, https://doi.org/10.1016/j.jlumin.2022.118847

A series of LaGa1–xO3:Cr3+x phosphors (x = 0.002, 0.005, 0.01, 0.02, 0.04) were synthesised by solid-state reaction and structurally characterised by Rietveld refinement from powder X-ray diffraction data. Amongst the five compounds, that with x = 0.... Read More about Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry.

Donor-Acceptor Boron-Ketoiminate Complexes with Pendent N-Heterocyclic Arms: Switched-on Luminescence through N-Heterocycle Methylation (2021)
Journal Article
Lozada, I. B., Ortiz, R. J., Braun, J. D., Williams, J. G., & Herbert, D. E. (2022). Donor-Acceptor Boron-Ketoiminate Complexes with Pendent N-Heterocyclic Arms: Switched-on Luminescence through N-Heterocycle Methylation. Journal of Organic Chemistry, 87(1), 184-196. https://doi.org/10.1021/acs.joc.1c02138

A series of intramolecular, donor-stabilized BF2 complexes supported by phenanthridinyl-decorated, β-ketoiminate chelating ligand scaffolds is described, along with their characterization by spectroscopy and X-ray diffraction. In solution, the relati... Read More about Donor-Acceptor Boron-Ketoiminate Complexes with Pendent N-Heterocyclic Arms: Switched-on Luminescence through N-Heterocycle Methylation.

Luminescent bis-tridentate iridium(III) complexes: Overcoming the undesirable reactivity of trans-disposed metallated rings using –N^N^N–coordinating bis(1,2,4-triazolyl)pyridine ligands (2021)
Journal Article
Walden, M. T., Yufit, D. S., & Williams, J. G. (2022). Luminescent bis-tridentate iridium(III) complexes: Overcoming the undesirable reactivity of trans-disposed metallated rings using –N^N^N–coordinating bis(1,2,4-triazolyl)pyridine ligands. Inorganica Chimica Acta, 532, Article 120737. https://doi.org/10.1016/j.ica.2021.120737

Nine new iridium(III) complexes featuring two tridentate ligands have been synthesised of the form Ir(N^C^N)(–N^N^N–), where N^C^N represents a cyclometallating ligand based on 1,3-di(2-pyridyl)benzene and –N^N^N– is a doubly deprotonated bis(1,2,4-t... Read More about Luminescent bis-tridentate iridium(III) complexes: Overcoming the undesirable reactivity of trans-disposed metallated rings using –N^N^N–coordinating bis(1,2,4-triazolyl)pyridine ligands.

Insights into the antibacterial mechanism of action of chelating agents by selective deprivation of iron, manganese and zinc (2021)
Journal Article
Paterson, J. R., Beecroft, M. S., Mulla, R. S., Osman, D., Reeder, N. L., Caserta, J. A., …Sharples, G. J. (2022). Insights into the antibacterial mechanism of action of chelating agents by selective deprivation of iron, manganese and zinc. Applied and Environmental Microbiology, https://doi.org/10.1128/aem.01641-21

Bacterial growth and proliferation can be restricted by limiting the availability of metal ions in their environment. Humans sequester iron, manganese and zinc to help prevent infection by pathogens, a system termed nutritional immunity. Commercially... Read More about Insights into the antibacterial mechanism of action of chelating agents by selective deprivation of iron, manganese and zinc.

Brightly Luminescent Platinum Complexes of N∧C–∧N Ligands Forming Six-Membered Chelate Rings: Offsetting Deleterious Ring Size Effects Using Site-Selective Benzannulation (2021)
Journal Article
Ortiz, R. J., Braun, J. D., Williams, J. G., & Herbert, D. E. (2021). Brightly Luminescent Platinum Complexes of N∧C–∧N Ligands Forming Six-Membered Chelate Rings: Offsetting Deleterious Ring Size Effects Using Site-Selective Benzannulation. Inorganic Chemistry, https://doi.org/10.1021/acs.inorgchem.1c02551

Brightly emissive platinum(II) complexes (λemission,max = 607–612 nm) of the type RLPtCl are reported, where RL is a cyclometalated N∧C–∧N-coordinating ligand derived from 1,3-di(2-trifluoromethyl-4-phenanthridinyl)benzene (CF3LH) or 1,3-di(2-tert-bu... Read More about Brightly Luminescent Platinum Complexes of N∧C–∧N Ligands Forming Six-Membered Chelate Rings: Offsetting Deleterious Ring Size Effects Using Site-Selective Benzannulation.

Platinum(ii) complexes of benzannulated N∧N−∧O-amido ligands: bright orange phosphors with long-lived excited states (2021)
Journal Article
Lozada, I. B., Williams, J. G., & Herbert, D. E. (2022). Platinum(ii) complexes of benzannulated N∧N−∧O-amido ligands: bright orange phosphors with long-lived excited states. Inorganic Chemistry Frontiers, 9(1), 10-22. https://doi.org/10.1039/d1qi01120k

The synthesis, structural characterization and photophysical properties of a series of platinum(II) complexes of benzannulated pincer-type diarylamido ligands are described. The ligands all contain tricyclic phenanthridine (3,4-benzoquinoline) rings... Read More about Platinum(ii) complexes of benzannulated N∧N−∧O-amido ligands: bright orange phosphors with long-lived excited states.

Synthesis, structures and luminescence properties of N^C^N-coordinated platinum(II) complexes based on an anthracene core: a red shift and a twist (2021)
Journal Article
Wood, E. A., Gildea, L. F., Yufit, D. S., & Williams, J. G. (2021). Synthesis, structures and luminescence properties of N^C^N-coordinated platinum(II) complexes based on an anthracene core: a red shift and a twist. Polyhedron, 207, Article 115401. https://doi.org/10.1016/j.poly.2021.115401

1,8-Bis(2-pyridyl)anthracene HL2 is shown to act as a tridentate, N^C^N-coordinating ligand to platinum(II), undergoing metallation at position 9 of the anthracene. The structures of Pt(N^C^N-L2)Cl and of HL2 have been determined by X-ray diffraction... Read More about Synthesis, structures and luminescence properties of N^C^N-coordinated platinum(II) complexes based on an anthracene core: a red shift and a twist.

Helically chiral NHC‐gold(I) complexes: synthesis, chiroptical properties and electronic features of the [5]helicene‐imidazolylidene ligand (2021)
Journal Article
Gauthier, E. S., Cordier, M., Dorcet, V., Vanthuyne, N., Favereau, L., Williams, J. G., & Crassous, J. (2021). Helically chiral NHC‐gold(I) complexes: synthesis, chiroptical properties and electronic features of the [5]helicene‐imidazolylidene ligand. European Journal of Organic Chemistry, 2021(34), 4769-4776. https://doi.org/10.1002/ejoc.202100722

The golden twist: Monodentate [5]helicene-imidazolylidene gold(I) complexes were prepared in good yields and structurally characterized. Benefiting from the presence of the configurationally stable [5]helicenic unit, they exhibit appealing chiroptica... Read More about Helically chiral NHC‐gold(I) complexes: synthesis, chiroptical properties and electronic features of the [5]helicene‐imidazolylidene ligand.

Enantioenriched Ruthenium-Tris-Bipyridine Complexes Bearing One Helical Bipyridine Ligand: Access to Fused Multihelicenic Systems and Chiroptical Redox Switches (2021)
Journal Article
Kos, M., Rodríguez, R., Storch, J., Sýkora, J., Caytan, E., Cordier, M., …Crassous, J. (2021). Enantioenriched Ruthenium-Tris-Bipyridine Complexes Bearing One Helical Bipyridine Ligand: Access to Fused Multihelicenic Systems and Chiroptical Redox Switches. Inorganic Chemistry, https://doi.org/10.1021/acs.inorgchem.1c01379

The synthesis and photophysical and chiroptical properties of novel aza[n]helicenes (6a–d, 10a,b, n = 4–7) substituted with one or two 2-pyridyl groups are described. The preparation was performed via an adapted Mallory reaction using aromatic imines... Read More about Enantioenriched Ruthenium-Tris-Bipyridine Complexes Bearing One Helical Bipyridine Ligand: Access to Fused Multihelicenic Systems and Chiroptical Redox Switches.

The Role of Dinuclearity in Promoting Thermally Activated Delayed Fluorescence (TADF) in Cyclometallated, N^C^N-coordinated Platinum(II) Complexes (2021)
Journal Article
Pander, P. H., Zaytsev, A., Sil, A., Williams, J. G., Lanoë, P., Kozhevnikov, V. N., & Dias, F. B. (2021). The Role of Dinuclearity in Promoting Thermally Activated Delayed Fluorescence (TADF) in Cyclometallated, N^C^N-coordinated Platinum(II) Complexes. Journal of Materials Chemistry C Materials for optical and electronic devices, 9(32), 10276-10287. https://doi.org/10.1039/d1tc02562g

In this work we present synthesis and an in-depth photophysical analysis of a di-Pt(II) complex with a ditopic bis-N^C^N ligand. The complex exhibits a dual luminescent behaviour by emitting simultaneously delayed fluorescence and phosphorescence. By... Read More about The Role of Dinuclearity in Promoting Thermally Activated Delayed Fluorescence (TADF) in Cyclometallated, N^C^N-coordinated Platinum(II) Complexes.

Triskelion-shaped iridium-helicene NHC complex (2021)
Journal Article
Crassous, J., Gauthier, E. S., Hellou, N., Caytan, E., Fré, S. D., Vanthuyne, N., …Srebro-Hooper, M. (2021). Triskelion-shaped iridium-helicene NHC complex. Inorganic Chemistry Frontiers, 8(16), 3916-3925. https://doi.org/10.1039/d1qi00527h

Enantiopure tris-helicenic chiral-at-iridium complexes have been prepared, constituting the first examples of organometallic metal-tris-helicenes. They have the mer- or fac-Ir(C^C:)3 form, where (C^C:) is an N-heterocyclic carbene ligand N-substitute... Read More about Triskelion-shaped iridium-helicene NHC complex.