Novel photochromic dithienylethene-based platinum(II) complexes (C^N^N)Pt(C≡C-DTE-C6H4-D) ((C^N^N) = 4,4'-di(n-hexyl)-6-phenyl-2,2'-bipyridine; D H, NMe2) were prepared and characterized. Their excellent properties allow the photoinduced switching of their second-order nonlinear optical in solution, as measured by EFISH technique, due to formation an extended π-conjugated ligand upon suitable electromagnetic radiation. Insights into electronic structures nature excited states have been...

The photophysical and electrochemical properties of the novel complexes [Ir(ppy)(2)(5-X-1,10-phen)][PF(6)] (ppy = 2-phenylpyridine, phen phenanthroline, X NMe(2), NO(2)), [Ir(pq)(2)(5-X-1,10-phen)][PF(6)] (pq 2-phenylquinoline, H, Me, [Ir(ppy)2(4-Me,7-Me-1,10-phen)][PF(6)], [Ir(ppy)2(5-Me,6-Me-1,10-phen)][PF(6)], [Ir(ppy)(2)(2-Me,9-Me-1,10-phen)][PF(6)], [Ir(pq)2(4-Ph,7-Ph-1,10-phen)][PF(6)] have been investigated compared with those known reference [Ir(ppy)(2)(4-Me or 5-H...

A new multifunctional coating for photovoltaic cells incorporating light‐management, UV‐protection, and easy‐cleaning capabilities is presented. Such consists of a photocurable fluorinated polymer embedding luminescent europium complex that acts as down‐shifting (LDS) material converting UV photons into visible light. The combination this system with ruthenium‐free organic dye‐sensitized solar (DSSCs) gives 70% relative increase in power conversion efficiency compared control uncoated...

The structural, emissive, and nonlinear optical properties of new CuI adducts with para-substituted trans-stilbazolic pyridinic ligands are reported. Single-crystal X-ray diffraction results indicate that the para-substituent on organic ligand greatly influences structural motif by its steric (tert-butyl), electronic/steric (dimethylamino), or bridging-donor (cyano) so two absolutely motifs, polymeric oligomeric, found when trans-stilbazole pyridine carry a dimethylamino group in...

The Pt(II) complex N^C2^N-1,3-di(2-pyridyl)benzene platinum chloride (PtL1Cl) is known to display efficient triplet luminescence in the green region of spectrum, and form an unusually emissive excimer that emits around 690 nm. In this contribution, introduction trifluoromethyl groups into either 4- or 5-position pyridyl rings ligand shown lead a red-shift band, moving it near infra-red (NIR) region. new ligands, synthesised by Suzuki Stille cross-coupling methods, are...

A series of cationic Ir(III) substituted bipyridyl ()(N(∧)N (N(∧)N-bpy) complexes incorporating electron-donor and -acceptor substituents, [Ir(C(∧)N-ppy-R')(2)(N(∧)N-bpy-CH═CH-C(6)H(4)-R)][X] (X(-) = PF(6)(-) or C(12)H(25)SO(3)(-)), 2 (a, R NEt(2) R' Me; b, O-Oct c, NO(2) C(6)H(13); C(∧)N-ppy cyclometalated 2-phenylpyridine, [Ir(C(∧)N-ppy-Me)(2)(N(∧)N-bpy-CH═CH-thienyl-Me)][PF(6)], 2d, the dithienylethene (DTE)-containing complex 2e have been synthesized characterized, their absorption,...

Two new cyclometallated platinum(II) complexes have been prepared that incorporate a terdentate N^C^N-coordinating ligand and monodentate acetylide co-ligand. The complexes, namely [PtL3–CC–C6H3F2] [PtL6–CC–C6H3F2] (where HL3 = 5-methyl-1,3-di(2-pyridyl)benzene; HL6 5-mesityl-1,3-di(2-pyridyl)benzene; H–CC–C6H3F2 3,5-difluorophenylacetylene), were by metathesis from the corresponding chloro complex PtLnCl. Both of are intensely luminescent in solution, displaying quantum yields superior to...

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 platinum(II) complexes PtL1X (X = Cl, NCS) PtL2Cl. Both ligands are intensely luminescent in solution (quantum yields > 0.8). display high quantum whereas that of PtL2Cl is very low due to the ease which trans cis isomerisation diphenylaminostyryl CC...

Two cyclometallated platinum(II) complexes, N^C^N-5-fluoro-1,3-di(2-pyridyl)benzene chloride, FPtCl, and N^C^N-5-methyl-1,3-di(2-pyridyl)benzene isothiocyanate, MePtNCS, have been synthesized characterized. Both complexes are highly efficient phosphorescent green emitters which can also display excimer emission in the red region. They studied as triplet solution-processed, multilayer organic light-emitting diodes (OLEDs), together with known complex of 5-methyl-1,3-di(2-pyridyl)benzene,...

[PtL6X] {X = Cl or NCS and L6 5-mesityl-1,3-di(2-pyridyl)-benzene} display similar luminescence in solution but, the solid state, packing of molecules is different, with short Pt⋯Pt interactions for X NCS, leading to a red-shifted emission band. The effect has been used generate OLEDs that emit squarely NIR region (855 nm).

A tetracoordinated redox couple, made by [Cu(2-mesityl-4,7-dimethyl-1,10-phenanthroline)2][PF6], 1, and its Cu(II) form [Cu(2-mesityl-4,7-dimethyl-1,10-phenanthroline)2][PF6]2, 2, has been synthesized, electrochemical photochemical features have investigated compared with those of a previously published Cu2+/Cu+ shuttle, namely, [Cu(2,9-dimethyl-1,10-phenanthroline)2][PF6], 3, pentacoordinated oxidized [Cu(2,9-dimethyl-1,10-phenanthroline)2Cl][PF6], 4. The detrimental effect the fifth Cl–...

A simple new heteroleptic copper dye, bearing one 2,9-dimesityl-1,10-phenanthroline and a 6,6′-dimethyl-2,2′-bipyridine-4,4′-dibenzoic acid anchoring ligand, was used as photosensitizer in dye-sensitized solar cells (DSSCs). High power conversion efficiencies are reached not only with conventional I–/I3– electrolyte (40% relative efficiency respect to N719) but, remarkably, also well-designed copper-based electrolyte. These proof-of-principle "full-copper" DSSCs open fascinating route for...

Mixed M(II)/M(III) metal oxalates, as "stripes" connected through strong hydrogen bonding by para-dimethylaminobenzaldeide (DAMBA) and water, form an organic-inorganic 2D network that enables segregation in layers of the cationic organic NLO-phore trans-4-(4-dimethylaminostyryl)-1-methylpyridinium, [DAMS+]. The crystalline hybrid materials obtained have general formula [DAMS]4[M2M'(C2O4)6].2DAMBA.2H2O (M = Rh, Fe, Cr; M' Mn, Zn), their overall three-dimensional packing is non-centrosymmetric...

[Ir(ppy)(2)(5-R-1,10-phen)][PF(6)] (ppy = cyclometallated 2-phenylpyridine, phen phenanthroline, R H, Me, NMe(2), NO(2)) and [Ir(ppy)(2)(4-R',7-R'-1,10-phen)][PF(6)] (R' Ph) complexes are characterized by one of the highest second order NLO response (measured EFISH technique) reported for a metal complex, mainly due (as suggested theoretical SOS-TDDFT investigation) to MLCT processes from ppy-Ir based moiety acting as donor push system pi* orbitals phen, an acceptor pull system; good...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel synthesis of pyrrolidinones by cobalt carbonyl catalyzed carbonylation azetidines. A new ring-expansion-carbonylation reaction 2-vinylazetidines to tetrahydroazepinonesDominique Roberto and Howard AlperCite this: J. Am. Chem. Soc. 1989, 111, 19, 7539–7543Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 September...

A luminescent bis(salicylaldiminato)zinc(II) Schiff-base complex, 1, is characterized by a concentration dependent second-order nonlinear optical response, related to the degree of aggregation complex in dichloromethane solution. The formation monomeric adduct, addition Lewis base, such as pyridine, concentrated solutions leads switch-on quadratic hyperpolarizability. This represents an unprecedented mode NLO switching molecular materials.

Cyclometalated cationic Ir(III) complexes with substituted 1,10-phenanthrolines (1,10-phen), such as [Ir(ppy)(2)(5-R-1,10-phen)]Y (ppy=cyclometalated 2-phenylpyridine; R=NO(2), H, Me, NMe(2); Y(-)=PF(6) (-), C(12)H(25)SO(3) I(-)) and [Ir(ppy)(2)(4-R,7-R-1,10-phen)]Y (R=Me, Ph) are characterized by a significant second-order optical non linearity (measured the electrical field induced second harmonic generation (EFISH) technique). This nonlinearity is controlled MLCT processes from...

Diphenyl-(4-{2-[4-(2-pyridin-4-yl-vinyl)-phenyl]-vinyl}-phenyl)-amine (DPVPA) constitutes a novel acido-triggered reversible luminescent and nonlinear optical switch. Remarkably, for the first time Electric-Field Induced Second Harmonic generation (EFISH) technique is used to reveal protonation–deprotonation NLO contrast.

The synthesis, luminescence, and nonlinear optical properties of a new series Ir(ppy)3 (ppy = 2-phenylpyridine) complexes incorporating π-extended vinyl-aryl substituents at the para positions their pyridine rings are reported. Appropriate substitution pyridyl allows tuning luminescence second-order response this unusual family three-dimensional chromophores. Theoretical calculations were performed to evaluate dipole moments, gain insight into electronic structure, rationalize observed...

The first example of a sequential double nonlinear optical switch, induced by protonation and next upon irradiation with UV light.