Contrasted photochromic and luminescent properties in dinuclear Pt(II) complexes linked through a central dithienylethene unit

We disclose two unprecedented complexes built with a central dithienylethene photochrome connecting two cyclometalated Pt(ii) moieties either on the reactive carbon atoms or on the lateral non-reactive carbon atoms of the photochrome. The two systems show vastly different properties that are rationalised thanks to quantum-chemical calculations

A panchromatic, near infrared Ir(III) emitter bearing a tripodal C^N^C ligand as a dye for dye-sensitized solar cells

C.H. acknowledges the Région Bretagne, France for funding. EZ-C acknowledges the University of St Andrews and EPSRC (EP/M02105X/1) for financial support. EAG and HVF thank the ERC for a Starting Grant (p-TYPE, 715354).The synthesis of a new complex of the form [Ir(C^N^C)(N^N)Cl] [where C^N^C = 2-(bis(4-(tert-butyl)phenyl)methyl)pyridinato (dtBubnpy, L1 ) and N^N is diethyl [2,2'-bipyridine]-4,4'-dicarboxylate (deeb)] is reported. The crystal structure reveals an unusual tripodal tridentate C^N^C ligand forming three six-membered rings around the iridium center. The photophysical and electrochemical properties suggest the use of this complex as a dye in dye-sensitized solar cells. Time-Dependent Density Functional Theory (TD-DFT) calculations have been used to reveal the nature of the excited-states.PostprintPeer reviewe

Linear and nonlinear optical molecular switches based on photochromie metal complexes

International audienceThis chapter is devoted to our works made in the area of photochromie organometallic compounds which can be used for the photomodulation of the quadratic nonlinear optical (NLO) properties and for the photoregulation of the emission properties of the resulting systems. The first part is related to the design of chromophores combining two types of dithienylethene (DTE)-based bipyridine ligands with different metal fragments (Re1, Fe11, Ru11, Ir111, Cu1, Zn11) which give rise to multi-photochromic metal complexes. The photoregulation of their quadratic nonlinear optical (NLO) properties, as well as their luminescence properties, is then discussed. The last part deals with the synthesis, photochromic properties, and NLO-switching behavior of Cyclometallated platinum (II) complexes containing two types of DTE units bound to the metal through an alkynyl linkage. © Springer Japan KK 2017

Synthesis of 2-(fluorinated aryl)pyridine derivatives via palladium-catalyzed C–H bond arylation of fluorobenzenes using 2-halopyridines as aryl sources

International audienceWe report herein on palladium-catalyzed direct arylation of (poly)fluorobenzene derivatives in the presence of 2-halopyridines for the one-step synthesis of 2-[(poly)fluorinated aryl]pyridine derivatives. The reactivity of 2-bromopyridines strongly dependents on its substituents at C6 position. The reaction proceeds nicely using a diphosphine palladium catalyst, and potassium pivalate/dimethylacetamide (PivOK/DMA) as catalytic system. The reaction was regioselective and occurred at the ortho-position of fluorine atoms

Reactivity of 4-phenylthiazoles in ruthenium catalyzed direct arylations

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Palladium-catalysed direct arylation of a tris-cyclometallated Ir(III) complex bearing 2,2′-thienylpyridine ligands: a powerful tool for the tuning of luminescence properties

International audiencePalladium-catalysed direct 5-arylation of metallated thiophenes of fac-Ir(NC3′-thpy)3 with aryl bromides via C-H bond functionalisation allows the synthesis of a variety of new Ir complexes in only one step (thpyH = 2,2′-thienylpyridine). The method offers simple modification of the nature of the ligand and hence of the photophysical properties of such complexes

Transfer hydrogenation of N-benzylideneaniline catalyzed by ruthenium complexes with pincer-type phosphorus nitrogen ligands using propan-2-ol as the hydrogen source

International audienceRuthenium complexes containing phosphorus-nitrogen, pincer-type (NPN) ligands show high activities and selectivities in the transfer hydrogenation of N-benzylideneaniline using propan-2-ol as the hydrogen source. Such is the case of complexes RuCl2PPh3(PPh(NHPy)(2)) (1) and RuCl2PPh3(PPh(NHPyMe)(2)) (2) which also show TOFs 5989 h(-1) and 5928 h(-1), respectively. These remarkable results were obtained after only 10 min of reaction using a 1000/1 substrate/catalyst ratio

Hydrogenation of N-benzylideneaniline by palladium (II) catalysts with phosphorus-nitrogen ligands using formic acid as a renewable hydrogen source

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