Novel ter(9,9-diarylfluorene)s were synthesized by a Suzuki-coupling reaction of 2-bromofluorene (1) and 2,7-fluorenediboronic ester derivatives (3) with high isolated yields (63-86%). The X-ray structure analysis ter(9,9'-spirobifluorene) (4aa) revealed that the conjugated chromophore adopts helical conformation. This conformation effectively releases steric interaction between fluorene moieties prevents inter-chromophore interactions. introduction aryl groups at C9 position was highly...

A series of luminescent mono- and binuclear cyclometalated platinum(II) complexes, namely [Pt(L1-6)Cl] (1a−6a; HL1-6 = 4-(aryl)-6-phenyl-2,2'-bipyridine; aryl H (1), phenyl (2), 4-chlorophenyl (3), 4-tolyl (4), 4-methoxyphenyl (5), 3,4,5-trimethoxyphenyl (6)), [Pt(L1)E]+ (E py (7), PPh3 (8)), [Pt2(L1-6)2(μ-dppm)]2+ (1b−6b, dppm bis(diphenylphosphino)methane), [Pt2(L1)2(μ-pz)]+ (9, Hpz pyrazole), [Pt2(L1)2(μ-dppCn)]2+ (dppCn bis(diphenylphosphino)propane (10, n 3) -pentane (11, 5)), were...

Rational design and syntheses of four iridium complexes (1-4) bearing two substituted quinoxalines an additional 5-(2-pyridyl) pyrazolate or triazolate as the third coordinating ligand are reported. Single-crystal X-ray diffraction studies 1 reveal a distorted octahedral geometry, in which dpqx ligands adopt eclipse configuration, for quinoxaline N atoms C orthometalated phenyl groups located at mutual trans- cis-positions, respectively. The lowest absorption band all consists mixture...

White electroluminescent (EL) emission from single-layered solid-state light-emitting electrochemical cells (LECs) based on host−guest cationic iridium complexes has been successfully demonstrated. The devices show white EL spectra (Commission Internationale de l'Eclairage coordinates ranging (x, y) = (0.45, 0.40) to (0.35, 0.39) at 2.9−3.3 V with high color rendering indices up 80. Peak external quantum efficiency and peak power of the LEC reach 4% 7.8 lm/W, respectively. These results...

A highly robust metal-organic zeotype was created by expansion of the zeolite topology. The novel nanoporous material [Co5(im)10⋅2 MB]∞ (see structure) exhibits not only a zeolite-like topology, but also chemically functionalizable properties zeolites; im=imidazole, MB=3-methyl-1-butanol.

Extensive investigations of asymmetric intermolecular cyclopropanation terminal alkenes with diazoacetates catalyzed by ruthenium porphyrin [Ru(P*)(CO)(EtOH)] (1, H2P = 5,10,15,20-tetrakis[(1S,4R,5R,8S)-1,2,3,4,5,6,7,8-octahydro-1,4:5,8-dimethanoanthracene-9-yl]porphyrin) and the application catalyst 1 to intramolecular allylic or homoallylic are described. The styrene its derivatives ethyl diazoacetate afforded corresponding cyclopropyl esters in up 98% ee high trans/cis ratios 36 extremely...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of carbonylmetalloporphyrins. The structure (pyridine)(carbonyl)(5,10,15,20-tetraphenylporphinato)iron(II)Shie-Ming Peng and James A. IbersCite this: J. Am. Chem. Soc. 1976, 98, 25, 8032–8036Publication Date (Print):December 1, 1976Publication History Published online1 May 2002Published inissue 1 December 1976https://pubs.acs.org/doi/10.1021/ja00441a025https://doi.org/10.1021/ja00441a025research-articleACS PublicationsRequest reuse...

This study fabricates and characterizes ultraviolet (UV) photosensors with ZnO nanorods (NRs). The NR arrays were selectively grown in the gap between interdigitated (IDT) electrodes of devices using hydrothermal solution processes a lithography-based technique. Compared conventional photosensor without NRs, proposed UV have much higher photoresponse region. Additionally, photoconductive gain an increased as illumination time increased; it varied at 34.45-5.32 x 10(2) under by 18.28 mW/cm(2)...

Two neutral pyrazolato diimine rhenium(I) carbonyl complexes with formula [Re(CO)(3)(N-N)(btpz)] where N-N = 2,2'-bipyridine (1) and 1,10-phenanathroline (2), btpz 3,5-bis(trifluoromethyl) pyrazolate, were synthesized characterized by elemental analysis, routine spectroscopic methods, single-crystal X-ray diffraction study. Ground excited state properties of these investigated steady-state time-resolved spectroscopies. Complexes 1 2 show photoluminescent emission in both solution solid-state...

An alternative string theory: The current-versus-potential behavior of metal atom strings (Ni, Co, Cr) is dependent on the strength d-orbital coupling along chain. Penta- and heptachromium each exhibit two sets primary I–V curves, which depend whether CrCr bonds alternate are localized, or delocalized (see picture).

Metal-semiconductor-metal (MSM) ultraviolet (UV) photodetectors with ZnO nanorods (NRs) have been fabricated and characterized in this investigation. The NR arrays were selectively grown on the gap of interdigitated electrodes by chemical solution method through a photolithography process. Compared to traditional MSM photodetector no NRs, UV showed much higher photoresponsity. As result, it can be attributed high surface-to-volume ratio NRs such photoresponse could strongly depend oxygen...

Abstract Highly efficient orange and green emission from single‐layered solid‐state light‐emitting electrochemical cells based on cationic transition‐metal complexes [Ir(ppy) 2 sb]PF 6 [Ir(dFppy) (where ppy is 2‐phenylpyridine, dFppy 2‐(2,4‐difluorophenyl)pyridine, sb 4,5‐diaza‐9,9′‐spirobifluorene) reported. Photoluminescence measurements show highly retained quantum yields for in neat films (compared with of these dispersed m ‐bis( N ‐carbazolyl)benzene films). The spiroconfigured ligands...

The relative stability of single He defects in bcc and fcc metals is investigated using ab initio calculations based on density functional theory. results indicate that the tetrahedral position energetically more favorable for a interstitial than octahedral site metals, but varies, depending local environments. formation energies Fe Ni at positions with without spin polarization are investigated. It interest to find magnetism host atoms does not directly affect stabilities sites Ni.

Nickel′s eleven: A metal chain consisting of four dinuclear mixed-valent Ni23+ units linked together by three square-planar Ni2+ has been prepared (see picture the real molecular model in lobby chemistry building at National Taiwan University). The electronic and magnetic properties this linear complex containing 11 nickel atoms are reported. Detailed facts importance to specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset....

Abstract The study of metal string complexes with 1D transition‐metal frameworks began in the early 1990s. As these provide great insights into metal–metal multiple bonds and may have potential applications as molecular wires, this field research has grown past 20 years. such, electronic structures simplest trinuclear complexes, supporting ligand systems, single‐molecular conductance are discussed. This review introduces development summarizes some important results newly designed...

Both anti–anti–anti–anti and syn–syn–syn–syn conformations of the bound metal ions are possible with new ligand N,N′-bis(α-pyridyl)-2,6-diaminopyridine (H2tpda). Pentanuclear CoII NiII complexes accessible this (see sketch on right). The chain is helically wrapped by four all-syn tpda ligands.

The mononuclear cyclometalated Pd(II) complexes [Pd(L1)X] (HL1 = 6-phenyl-2,2'-bipyridine; X Cl, la; Br, 1b; I, 1c), [Pd(L1)PPh3]+ (1d), [Pd(L2-5)Cl] [2a-5a, HL2-5 4-(aryl)-6-phenyl-2,2'-bipyridine; aryl phenyl (2), 4-chlorophenyl (3), 4-tolyl (4), 4-methoxyphenyl (5)] and the binuclear derivatives [Pd2(L1-5)2(mu-dppm)]2+ (1e-5e, dppm bis(diphenylphosphino)methane) [Pd2(L1)2(mu-dppCs)]2+, (1f, dppC5 1,5-bis(diphenylphosphino)pentane) were prepared. crystal structures of 1d(ClO4), 1e(ClO4)2 x...

Abstract Ir (III) metal complexes with formula [(nazo) 2 Ir(Fppz)] ( 1 ), Ir(Bppz)] and Ir(Fptz)] 3 ) [(nazo)H = 4‐phenyl quinazoline, (Fppz)H 3‐trifluoromethyl‐5‐(2‐pyridyl) pyrazole, (Bppz)H 3‐ t ‐butyl‐5‐(2‐pyridyl) (Fptz)H triazole] were synthesized, among which the exact configuration of was confirmed using single‐crystal X‐ray diffraction analysis. These exhibited bright red phosphorescence relatively short lifetimes 0.4–1.05 μs in both solution solid‐state at room temperature....

The nonionic, red-emitting complexes [Os(fppz)2L2] (L = PPh2Me (1), PPhMe2 (2)) and [Os(bptz)2L2] (3)) were synthesized, showing highly intense red phosphorescent emission in CH2Cl2 solution at λmax 617, 632, 649 nm, respectively. electroluminescent properties of these compounds on OLEDs showed promising device efficiencies required for future OLED applications.

Abstract The rational design and syntheses of Pt(iqdz) 2 ( 1 ) Pt(pydz) bearing isoquinolinyl indazole (iqdz)H or pyridyl (pydz)H groups on the coordinating ligands are reported. Single‐crystal X‐ray diffraction studies reveal a square planar geometry, in which two iqdz adopt trans‐configuration. Short N…H contacts (∼2.21 Å) detected between ortho‐hydrogen atom isoquinoline adjacent N fragment, making overall molecular geometry analogous to that platinum( II porphyrinato complexes. lowest...

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMetal String Complexes: Synthesis and Crystal Structure of [Ni4(μ4-phdpda)4] [Ni7(μ7-teptra)4Cl2] (H2phdpda = N-Phenyldipyridyldiamine H3teptra Tetrapyridyltriamine)Shie-Yang Lai, Tzu-Wei Lin, Yu-Hua Chen, Chih-Chieh Wang, Gene-Hsiang Lee, Ming-hwa Yang, Man-kit Leung, Shie-Ming PengView Author Information Department Chemistry, National Taiwan University Taipei, Cite this: J. Am. Chem. Soc. 1999, 121, 1, 250–251Publication Date (Web):December...

The synthesis and characterization of a new series charge-neutral RuII metal complexes are reported. compound [Ru(ifpz)2(PPh2Me)2] is very attractive candidate for the fabrication saturated red phosphorescent organic light-emitting diode devices (see Figure) with high brightness low turn-on voltage.