Many congratulations to Trinity College Dublin team Dr. Oxana Kotova, Dr. Steve Comby, Dr. Komala Pandurangan (now at Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR)), Dr. Floriana Stomeo (now at IPSEN Pharma), Dr. John E. O’Brien and Dr. Martin Feeney who in collaboration with Dr. Robert D. Peacock from University of Glasgow and Prof. Colin P. McCoy from Queen’s University Belfast who have had their paper entitled “The effect of the linker size in C2-symmetrical chiral ligands on the self-assembly formation of luminescent triple-stranded di-metallic Eu(III) helicates in solution” accepted in Dalton Transactions.
The article discussed the formation of chiral, luminescent [Eu2:L3] assemblies with high stability constants in solution. However, it was found that the composition of the assemblies in the solid state was more complex. The chirality of the studied systems allowed us to investigate their formation using various techniques including circular dichroism and circularly polarised luminescence spectroscopies and help their development towards materials for the applications in electronics for virtual reality applications (3D screens) and in medical diagnostic.
The article is available online at: https://pubs.rsc.org/en/content/articlelanding/2018/dt/c8dt02753f#!divAbstract
Our paper “Two-Photon Luminescent Bone Imaging Using Europium Nanoagents“, published last year in Cell Press’ journal Chem, was highlighted by the journal as one of six papers from 2016 that was of particular scientific importance. Once again, congrats to Esther and Steve on their work.
Congratulations to Laura (now at Pfizer), Sam, Steve and Oxana on their new communication published in ChemPhysChem. In this work, invited to a special issue on Molecular Logic, AuNPs were described that were functionalised with Eu(III) and Tb(III) cyclen complexes which were able to function as molecular logic gate mimics (MLGMs). Two MLGMs were reported operating using pH and organic molecule inputs, respectively, which were able to mimic half-subtractor, transfer and XOR logic functions.
Logic and Molecular logic have important history in Ireland, with George Boole developing his ideas in UCC (formerly Queen’s College Cork) and the early ideas of PET sensors as MLGMs being introduced by Prof. A.P. de Silva in Queen’s University Belfast. The TG Group has described a number of MLGMs over the years, most recently in materials systems such as our organogel-based system reported in Chem. Commun. last year. Our paper in ChemPhysChem is a further demonstration of the use of materials-supported Ln(III) luminescence, this time on AuNP surfaces and the power of logical analysis as an approach to supramolecular and sensing chemistry.
ChemPhysChem is a ChemPub Soc Europe journal, a consortium of 16 continental European chemical societies and published in collaboration with Wiley-VCH, and we are happy to have contributed to high impact European science.
Varying the colour of the emission by altering the molar fraction of europium in the system (𝛘Eu)
Congratulations to Oxana Kotova, Steve Comby and Christophe Lincheneau on their paper entitled “White-light emission from discrete heterometallic lanthanide-directed self-assembled complexes in solution” which has been accepted into the RSC journal Chemical Science. In this work, the newly designed multidentate ligand tdt was used, which provides three individual tridentate binding sites for lanthanide (Ln) ions. White-light emission was successfully achieved by carefully tuning (i) the molar ratio of Eu(III) and Tb(III) within the assembly and thus the relative intensity of the red and green emission, (ii) the excitation wavelength, as the tdt ligand consists of two different chromophores, and (iii) the ligand concentration, which greatly affects the intensity of the blue emission within the overall self-assembled complexes. We envisage that this system can be further developed and find its application as white-light emitting material or as a ratiometric sensor.
Many congratulations to Chris, Dawn and Salvador who had their paper “Structure direction, solvent effects and anion influences in halogen-bonded adducts of 2,6-bis(iodoethynyl)pyridine” accepted in the ACS journal Crystal Growth & Design and to Esther and Steve who had their paper “Cyclen lanthanide-based micellar structures for application as luminescent [Eu(III)] and magnetic [Gd(III)] resonance imaging (MRI) contrast agents” accepted in the RSC journal Chemical Communications. Both papers represent new areas within the TG research group; the former being the first publication from the group on the use of halogen bonding in self-assembly formation, while the latter presents the first examples of the formation of lanthanide based self-assembly micelles. This contribution was also the 200th to be accepted from the TG group. Well done to you all!
Various members of the TG Group were involved in the meeting on Photochemistry and Photochemical effects organised by the RSC Photochemical Group with Dublin Chemistry and incorporating the Young and Early Career Researchers’ Meeting 2011. Despite the visit of Queen Elizabeth II to Trinity College, the meeting went ahead in UCD on Monday and Tuesday, before returning to the intended venue for the final day. Dr Steve Comby gave a talk on sensing of biologically relevant d-metal ions using lanthanides cyclen-based luminescent displacement assays in aqueous solution. Robert Elmes spoke the next day about his work on ruthenium (II) polypyridyl complexes as potential DNA probes and anti-cancer phototherapetics. Posters were presented by Swagata Banerjee, Dawn Barry, Jon Kitchen, and Robert Elmes. The meeting was a great success thanks to organisers Rachel Evans, John Kelly and Han Vos.