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Professor Gareth Williams' Outputs (99)

Rigidly linking cyclometallated Ir(III) and Pt(II) centres: an efficient approach to strongly absorbing and highly phosphorescent red emitters (2017)
Journal Article
Turnbull, G., Williams, J., & Kozhevnikov, V. (2017). Rigidly linking cyclometallated Ir(III) and Pt(II) centres: an efficient approach to strongly absorbing and highly phosphorescent red emitters. Chemical Communications, 53(18), 2729-2732. https://doi.org/10.1039/c7cc00656j

The synthesis and photophysical properties of an unprecedented tetranuclear complex are described, in which a fac-tris-cyclometallated Ir(III) centre is rigidly connected to three cyclometallated Pt(II) centres. The complex absorbs strongly up to ∼60... Read More about Rigidly linking cyclometallated Ir(III) and Pt(II) centres: an efficient approach to strongly absorbing and highly phosphorescent red emitters.

Synthesis and Luminescence Properties of Cycloplatinated Complexes with a Chelating N∧C Pyridine-Derived N-Heterocyclic Carbene - Influence of 2,4,6-Triphenyl­phosphinine versus Triphenylphosphine (2016)
Journal Article
Moussa, J., Freeman, G. R., Williams, J. G., Chamoreau, L., Herson, P., & Amouri, H. (2016). Synthesis and Luminescence Properties of Cycloplatinated Complexes with a Chelating N∧C Pyridine-Derived N-Heterocyclic Carbene - Influence of 2,4,6-Triphenyl­phosphinine versus Triphenylphosphine. European Journal of Inorganic Chemistry, 2016(5), https://doi.org/10.1002/ejic.201500879

Tuning the dipolar second-order nonlinear optical properties of 5-π-delocalized-donor-1,3-di(2-pyridyl) benzenes, related cyclometallated platinum(II) complexes and methylated salts (2016)
Journal Article
Nisic, F., Cariati, E., Colombo, A., Dragonetti, C., Fantacci, S., Garoni, E., …Williams, J. (2017). Tuning the dipolar second-order nonlinear optical properties of 5-π-delocalized-donor-1,3-di(2-pyridyl) benzenes, related cyclometallated platinum(II) complexes and methylated salts. Dalton Transactions, 46(4), 1179-1185. https://doi.org/10.1039/c6dt04359c

The synthesis and characterization of three 5-π-delocalized-donor-1,3-di(2-pyridyl)benzenes is reported along with that of their related cyclometallated platinum(II) complexes and N,N-dimethylated iodide salts. The second-order nonlinear optical (NLO... Read More about Tuning the dipolar second-order nonlinear optical properties of 5-π-delocalized-donor-1,3-di(2-pyridyl) benzenes, related cyclometallated platinum(II) complexes and methylated salts.

Synthesis and Chiroptical Properties of Hexa-, Octa-, and Decaazaborahelicenes: Influence of Helicene Size and of the Number of Boron Atoms (2016)
Journal Article
Shen, C., Srebro-Hooper, M., Jean, M., Vanthuyne, N., Toupet, L., Williams, J., …Crassous, J. (2017). Synthesis and Chiroptical Properties of Hexa-, Octa-, and Decaazaborahelicenes: Influence of Helicene Size and of the Number of Boron Atoms. Chemistry - A European Journal, 23(2), 407-418. https://doi.org/10.1002/chem.201604398

Four members of a new class of cycloborylated hexa-, octa-, and deca-helicenes (1 a–d) have been prepared in enantiopure form, along with two cycloplatinated deca-helicenes (1 d′, 1 d1), further extending the family of cycloplatinated hexa- and octa-... Read More about Synthesis and Chiroptical Properties of Hexa-, Octa-, and Decaazaborahelicenes: Influence of Helicene Size and of the Number of Boron Atoms.

Metal Complexes for Two-Photon Photodynamic Therapy: A Cyclometallated Iridium Complex Induces Two-Photon Photosensitization of Cancer Cells under Near-IR Light (2016)
Journal Article
McKenzie, L., Sazanovich, I., Baggaley, E., Bonneau, M., Guerchais, V., Williams, J., …Bryant, H. (2017). Metal Complexes for Two-Photon Photodynamic Therapy: A Cyclometallated Iridium Complex Induces Two-Photon Photosensitization of Cancer Cells under Near-IR Light. Chemistry - A European Journal, 23(2), 234-238. https://doi.org/10.1002/chem.201604792

Photodynamic therapy (PDT) uses photosensitizers (PS) which only become cytotoxic upon light-irradiation. Transition-metal complexes are highly promising PS due to long excited-state lifetimes, and high photo-stabilities. However, these complexes usu... Read More about Metal Complexes for Two-Photon Photodynamic Therapy: A Cyclometallated Iridium Complex Induces Two-Photon Photosensitization of Cancer Cells under Near-IR Light.

New N^C^N-coordinated Pd(ii) and Pt(ii) complexes of a tridentate N-heterocyclic carbene ligand featuring a 6-membered central ring: synthesis, structures and luminescence (2016)
Journal Article
Moussa, J., Haddouche, K., Chamoreau, L., Amouri, H., & Williams, J. (2016). New N^C^N-coordinated Pd(ii) and Pt(ii) complexes of a tridentate N-heterocyclic carbene ligand featuring a 6-membered central ring: synthesis, structures and luminescence. Dalton Transactions, 45(32), https://doi.org/10.1039/c6dt02415g

We describe Pd(II) and Pt(II) complexes of an N^C^N-coordinating pincer-like ligand featuring two lateral pyridine rings and a 6-membered carbene core. Their crystal structures display 1-dimensional chains with short π–π and M(II)⋯M(II) interactions.... Read More about New N^C^N-coordinated Pd(ii) and Pt(ii) complexes of a tridentate N-heterocyclic carbene ligand featuring a 6-membered central ring: synthesis, structures and luminescence.

Conformational changes and chiroptical switching of enantiopure bis-helicenic terpyridine upon Zn2+binding (2016)
Journal Article
Isla, H., Srebro-Hooper, M., Jean, M., Vanthuyne, N., Roisnel, T., Lunkley, J. L., …Crassous, J. (2016). Conformational changes and chiroptical switching of enantiopure bis-helicenic terpyridine upon Zn2+binding. Chemical Communications, 52(35), 5932-5935. https://doi.org/10.1039/c6cc01748g

The molecular conformation of a bis-helicenic terpyridine system is strongly modified upon binding to Zn(II) ion, a process that is accompanied by large changes in the optical and chiroptical properties. This system affords a new type of helicene-bas... Read More about Conformational changes and chiroptical switching of enantiopure bis-helicenic terpyridine upon Zn2+binding.

Bimetallic Gold(I) Complexes with Ethynyl-Helicene and Bis-Phosphole Ligands: Understanding the Role of Aurophilic Interactions in their Chiroptical Properties (2016)
Journal Article
El Sayed Moussa, M., Chen, H., Wang, Z., Srebro-Hooper, M., Vanthuyne, N., Chevance, S., …Crassous, J. (2016). Bimetallic Gold(I) Complexes with Ethynyl-Helicene and Bis-Phosphole Ligands: Understanding the Role of Aurophilic Interactions in their Chiroptical Properties. Chemistry - A European Journal, 22(17), 6075-6086. https://doi.org/10.1002/chem.201600126

Monometallic gold(I)-alkynyl-helicene complexes (1 a,b) and bimetallic gold(I)-alkynyl-helicene architectures featuring the presence (2 a,b) or absence (3 a,b) of aurophilic intramolecular interactions were prepared by using different types of phosph... Read More about Bimetallic Gold(I) Complexes with Ethynyl-Helicene and Bis-Phosphole Ligands: Understanding the Role of Aurophilic Interactions in their Chiroptical Properties.

When two are better than one: bright phosphorescence from non-stereogenic dinuclear iridium(III) complexes (2016)
Journal Article
Daniels, R., Culham, S., Hunter, M., Durrant, M., Probert, M., Clegg, W., …Kozhevnikov, V. (2016). When two are better than one: bright phosphorescence from non-stereogenic dinuclear iridium(III) complexes. Dalton Transactions, 45(16), 6949-6962. https://doi.org/10.1039/c6dt00881j

A new family of eight dinuclear iridium(III) complexes has been prepared, featuring 4,6-diarylpyrimidines Ly as bis-N^C-coordinating bridging ligands. The metal ions are also coordinated by a terminal N^C^N-cyclometallating ligand LX based on 1,3-di(... Read More about When two are better than one: bright phosphorescence from non-stereogenic dinuclear iridium(III) complexes.

Pressure-induced variations of MLCT and ligand-centered luminescence spectra in square-planar platinum(II) complexes (2016)
Journal Article
Rodrigue-Witchel, A., Rochester, D. L., Zhao, S., Lavelle, K. B., Williams, J. G., Wang, S., …Reber, C. (2016). Pressure-induced variations of MLCT and ligand-centered luminescence spectra in square-planar platinum(II) complexes. Polyhedron, 108, 151-155. https://doi.org/10.1016/j.poly.2015.12.011

Solid-state luminescence spectra of five crystalline platinum(II) complexes at variable pressure and temperature are presented and compared. Maxima occur between 14 000 cm−1 and 15 600 cm−1 (approximately 700–640 nm) at ambient temperature and pressu... Read More about Pressure-induced variations of MLCT and ligand-centered luminescence spectra in square-planar platinum(II) complexes.

Acid/base-triggered switching of circularly polarized luminescence and electronic circular dichroism in organic and organometallic helicenes (2014)
Journal Article
Saleh, S., Moore, B., Srebro, M., Vanthuyne, N., Toupet, L., Williams, J., …Crassous, C. (2015). Acid/base-triggered switching of circularly polarized luminescence and electronic circular dichroism in organic and organometallic helicenes. Chemistry - A European Journal, 21(4), 1673-1681. https://doi.org/10.1002/chem.201405176

Electronic circular dichroism and circularly polarized luminescence acid/base switching activity has been demonstrated in helicene-bipyridine proligand 1 a and in its “rollover” cycloplatinated derivative 2 a. Whereas proligand 1 a displays a strong... Read More about Acid/base-triggered switching of circularly polarized luminescence and electronic circular dichroism in organic and organometallic helicenes.

Time-resolved emission imaging microscopy using phosphorescent metal complexes: taking FLIM and PLIM to new lengths (2014)
Journal Article
Baggaley, E., Weinstein, J., & Williams, J. (online). Time-resolved emission imaging microscopy using phosphorescent metal complexes: taking FLIM and PLIM to new lengths. Structure and bonding, https://doi.org/10.1007/430_2014_168

Luminescent metal complexes are increasingly being investigated as emissive probes and sensors for cell imaging using what is traditionally termed fluorescence microscopy. The nature of the emission in the case of second- and third-row metal complexe... Read More about Time-resolved emission imaging microscopy using phosphorescent metal complexes: taking FLIM and PLIM to new lengths.

A heterotrimetallic Ir(III), Au(III) and Pt(II) complex incorporating cyclometallating bi- and tridentate ligands : simultaneous emission from different luminescent metal centres leads to broad-band light emission (2014)
Journal Article
Muñoz-Rodríguez, R., Buñuel, E., Fuentes, N., Williams, J., & Cárdenas, D. (2015). A heterotrimetallic Ir(III), Au(III) and Pt(II) complex incorporating cyclometallating bi- and tridentate ligands : simultaneous emission from different luminescent metal centres leads to broad-band light emission. Dalton Transactions, 44(18), 8394-8405. https://doi.org/10.1039/c4dt02761b

Di- and tri-nuclear metal complexes incorporating gold(III), iridium(III) and platinum(II) units linked via a 1,3,5-triethynylbenzene core are reported, together with the corresponding mononuclear complexes as models. The gold(III) and platinum(II) u... Read More about A heterotrimetallic Ir(III), Au(III) and Pt(II) complex incorporating cyclometallating bi- and tridentate ligands : simultaneous emission from different luminescent metal centres leads to broad-band light emission.

Platinum(II) Complexes of N^C^N‑Coordinating 1,3-Bis(2-pyridyl)benzene Ligands: Thiolate Coligands Lead to Strong Red Luminescence from Charge-Transfer States (2014)
Journal Article
Tarran, W., Freeman, G., Murphy, L., Benham, A., Kataky, R., & Williams, J. (2014). Platinum(II) Complexes of N^C^N‑Coordinating 1,3-Bis(2-pyridyl)benzene Ligands: Thiolate Coligands Lead to Strong Red Luminescence from Charge-Transfer States. Inorganic Chemistry, 53(11), 5738-5749. https://doi.org/10.1021/ic500555w

A new family of platinum(II) complexes of the form PtLnSR have been prepared, where Ln represents a cyclometalating, NCN-bound tridentate ligand and SR is a monodentate thiolate ligand. The complexes fall into two groups, those of PtL1SR where HL1 =... Read More about Platinum(II) Complexes of N^C^N‑Coordinating 1,3-Bis(2-pyridyl)benzene Ligands: Thiolate Coligands Lead to Strong Red Luminescence from Charge-Transfer States.

Platinum(II) complexes with cyclometallated 5-pi-delocalized-donor-1,3-di(2-pyridyl)benzene ligands as efficient phosphors for NIR-OLEDs (2014)
Journal Article
Nisic, F., Colombo, A., Dragonetti, C., Roberto, D., Valore, A., Malicka, J., …Williams, J. (2014). Platinum(II) complexes with cyclometallated 5-pi-delocalized-donor-1,3-di(2-pyridyl)benzene ligands as efficient phosphors for NIR-OLEDs. Journal of Materials Chemistry C Materials for optical and electronic devices, 2(10), 1791-1800. https://doi.org/10.1039/c3tc32086c

Two new pincer proligands, namely 5-(p-(N,N-diphenylamino)phenylethynyl)-1,3-di(2-pyridyl)benzene (HL1) and trans-5-(p-(N,N-diphenylamino)styryl-1,3-di(2-pyridyl)benzene (HL2) were prepared together with their N^C^N-coordinated cyclometallated platin... Read More about Platinum(II) complexes with cyclometallated 5-pi-delocalized-donor-1,3-di(2-pyridyl)benzene ligands as efficient phosphors for NIR-OLEDs.

An unprecedented cyclometallated platinum(II)complex incorporating a phosphinine co-ligand: synthesis and photoluminescence behaviour (2014)
Journal Article
Moussa, J., Cheminel, T., Freeman, G., Chamoreau, L., Williams, J., & Amouri, H. (2014). An unprecedented cyclometallated platinum(II)complex incorporating a phosphinine co-ligand: synthesis and photoluminescence behaviour. Dalton Transactions, 43(22), 8162-8165. https://doi.org/10.1039/c4dt00589a

The first luminescent cyclometallated platinum(II) complex bearing phosphinine co-ligands is reported. The long-lived luminescence, which it displays at 77 K, is assigned to a phosphinine-localised triplet excited state on the basis of electrochemica... Read More about An unprecedented cyclometallated platinum(II)complex incorporating a phosphinine co-ligand: synthesis and photoluminescence behaviour.

Straightforward access to mono- and biscycloplatinated helicenes displaying circularly polarized phosphorescence by using crystallization resolution methods (2014)
Journal Article
Shen, C., Anger, E., Srebro, M., Vanthuyne, N., Deol, K., Jefferson, T., …Crassous, J. (2014). Straightforward access to mono- and biscycloplatinated helicenes displaying circularly polarized phosphorescence by using crystallization resolution methods. Chemical Science, 5(5), 1915-1927. https://doi.org/10.1039/c3sc53442a

Enantiopure mono-cycloplatinated-[8]helicene and bis-cycloplatinated-[6]helicene derivatives were prepared through column chromatography combined with crystallization of diastereomeric complexes using a chiral ancillary sulfoxide ligand. The UV-visib... Read More about Straightforward access to mono- and biscycloplatinated helicenes displaying circularly polarized phosphorescence by using crystallization resolution methods.

Long-lived metal complexes open up microsecond lifetime imaging microscopy under multiphoton excitation: from FLIM to PLIM and beyond (2013)
Journal Article
Baggaley, E., Botchway, S. W., Haycock, J. W., Morris, H., Sazanovich, I. V., Williams, J. G., & Weinstein, J. A. (2013). Long-lived metal complexes open up microsecond lifetime imaging microscopy under multiphoton excitation: from FLIM to PLIM and beyond. Chemical Science, 5(3), 879-886. https://doi.org/10.1039/c3sc51875b

Lifetime imaging microscopy with sub-micron resolution provides essential understanding of living systems by allowing both the visualisation of their structure, and the sensing of bio-relevant analytes in vivo using external probes. Chemistry is pivo... Read More about Long-lived metal complexes open up microsecond lifetime imaging microscopy under multiphoton excitation: from FLIM to PLIM and beyond.

Multifunctional and Reactive Enantiopure Organometallic Helicenes: Tuning Chiroptical Properties by Structural Variations of Mono- and Bis(platinahelicene)s (2011)
Journal Article
Anger, E., Rudolph, M., Norel, L., Zrig, S., Shen, C., Vanthuyne, N., …Réau, R. (2011). Multifunctional and Reactive Enantiopure Organometallic Helicenes: Tuning Chiroptical Properties by Structural Variations of Mono- and Bis(platinahelicene)s. Chemistry - A European Journal, 17(50), 14178-14198. https://doi.org/10.1002/chem.201101866