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Total records found : 6
Simplified search suggestions : Noorshida Mohd Ali
12013
thesis
Photophysical properties of polynuclear complexes containing phenylpyridine-iridium(III) units
Noorshida Mohd Ali
The content of this thesis is concerned with twofold areas of research: i) the synthesis of various types of bis(phenylpyridine) iridium(III) dicyanide complexes, and studies of their structural and photophysical behaviour; ii) the synthesis and studies of iridium(III) complexes, containing two fluorinated phenylpyridine-type ligands and two pyrazolylpyridine units, and their lanthanide complexes. Chapter One describes the general principles of luminescent cyclometallated complexes of transition metal ions. A brief introduction about spectroscopic properties of lanthanides and sensitisation of their luminescence is provided. Examples of previous research by Ward group and from other groups into cyanide-bridged d-f complexes and Ir/Ln bimetallic complexes are described. Chapter Two describes the synthesis of bis(phenylpyridine) iridium(III) dicyanide complexes and the used of these complexes as the basis of cyanide-bridged polynuclear assemblies, in both coordination networks with lanth.....

540 hits

22017
article
Synthesis and characterisation of Zinc/Aluminium-Layered Double Hydroxide-L-Phenylalanate Nanocomposites using ION exchange method
Mohd Sharif Sharifah Norain, Hashim Norhayati, Md Isa Illyas, Mohd Ali Noorshida, Muhamad Damanhuri Muhd Ibrahim,
2237 hits

32017
article
Synthesis and photophysical properties of bis(phenylpyridine) iridium(III) dicyanide complexes
Noorshida Mohd Ali
Our research group is focusing on luminescence of coordination compounds which based on cyanide bridging interactions. Recently, four cyanometallate complexes based on Ir(III) complex [Ir(ppy)2(CN)2] -,which is one of an extensive family of Ir(III) complexes based on cyclometallating phenylpyridine ligands that have achieved prominence for their desirable photophysical properties, were successfully synthesised. The present study showed that, the introduction of fluorine atoms to the phenyl rings could enhance the triplet excited state energy and thus caused a blue-shift phosphorescence peak (λem = 453 nm) as shown by (PPN)[Ir(2,4-F2ppy)2(CN)2] (1) compared to that of complex without fluorine atom (PPN)[Ir(ppy)2(CN)2] (4) (λem=474 nm). However, (PPN)[Ir(3,5-F2ppy)2(CN)2] (2) shows a negligible hypsochromic shift (λem = 473 nm) in the emission. Conversely, (PPN)[Ir(4-CF3ppy)2(CN)2] (3) shows a red-shift (λem = 479 nm) compared to complex (4). These complexes, like [Ru(bipy)(CN)4] 2âˆ.....

512 hits

42021
article
Solvatochromism and theoretical studies of dicyanobis(phenylpyridine)iridium(III) complex using density functional theory
Noorshida Mohd Ali
Luminescent cyanometallate [Ir(ppy)2(CN)2]? (ppy = C6H5C5H4N) has recently gained attention due to its desired photophysical properties. Our research group reported that the [Ir(ppy)2(CN)2]? has shown a negative solvatochromism like [Ru(bipy)(CN)4]2?, resulting in a blue-shift of the UV-Vis absorption bands in the water. Therefore, to gain insight into the specific solvent-solute interaction governed by the hydrogen bond in the solvation hydration shell, density functional theory (DFT) calculations were performed on the singlet ground state of the [Ir(ppy)2(CN)2]? and its solvent environment in the water at B3LYP level theory. It was demonstrated, seven water molecules provided a good description of the relevant spectra: IR and UV-Vis. The calculation reproduced the positions and intensities of the observed ?(C?N) bands at 2069 and 2089 cm?1. The calculated MLCT transition wavelength was 366 nm vs. a measured value of 358 nm, differing by 8 nm. The study revealed the water molecules in.....

404 hits

52021
article
Synthesis, spectroscopic, and photophysical studies of phosphorescent Bis(2-(2,4-difluorophenyl)pyridine)Iridium(III) complex containing derivative of 1H-1,2,4-triazole anchillary ligand
Noorshida Mohd Ali
A cationic complex of iridium(III), [Ir(2,4-F2ppy)2 (F2 bpyta)]PF6 utilizing 1,2,4-triazolepyridyl as an anchillary ligand modified with a 2,6-difluorobenzyl substituent was synthesized and characterized. The aromatic signals of pyridyltriazole and phenylpyridine proton were detected in the1 H-NMR spectrum between 10.00 and 7.00 ppm. Only one singlet peak was detected at 8.46 ppm H(8) shifted to the upfield, demonstrating that C5 was coordinated to the central iridium metal. The bands exhibited in the range of 1555?1431 cm?1 in the IR spectrum because of the C=C and C=N aromatic rings stretching pyridine, phenyl, and triazole vibrations. The UV-Vis absorption spectrum showed a slight and broad absorbance peak at lower energy at a lmax = 371 nm (e = 6129 M?1 cm?1) in the visible range due to1 MLCT and3 MLCT transitions. Blue emission was observed in the steady-state emission spectral of [Ir(2,4-F2 ppy)2 (F2 bpyta)]PF6 and the other two previously synthesized iridium(III) complexes in CH.....

370 hits

62023
article
Synthesis, spectroscopic characterizations, photophysical properties and DFT studies of a novel iridium(III) complex containing 2-(2-butoxy-4-fluorophenyl) pyridine ligand
Noorshida Mohd Ali
The iridium(III) complex, Ir(bFppy)2(pyim) (bFppy = 2-(2-butoxy-4-fluorophenyl)pyridine and pyim = 2-(1H-Imidazol-2-yl)pyridine) was excellently prepared between 2-(1H-Imidazol-2-yl)pyridine and chloro-bridged iridium(III) dimer via reflux reaction. Butoxy functional group and fluorine atom were added to the phenyl ring of 2-phenylpyridine at positions 2 and 4 respectively, as cyclometalating ligand. The Ir(bFppy)2(pyim) complex was characterized by spectroscopic methods: FTIR, NMR, LCMS and UVVis absorption. The presence of two sharp peaks at 1256 cm?1 and 1129 cm?1 due to ?(CO) was revealed by IR analysis. The bands appear in the range of 15941567 cm?1 owing to the C[dbnd]C and C[dbnd]N aromatic ring stretching vibrations of phenyl and pyridine. The 1H NMR spectrum showed signals in the range of ? 5.508.60 ppm corresponding to phenylpyridine and pyridylimidazole protons. In contrast, the proton signals in the range of ? 0.804.50 ppm, assignable to butyl substituent. The UVVis spectru.....

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