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1.
Naser E. Eltayeb Siang G. Teoh Eny Kusrini Rohana Adnan H.K. Fun 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2010,75(1):453-457
A new Mn(III) complex, [MnCl(H2O)(L)]·H2O·C2H5OH, where L = 2,2′-{1,2-phenylenebis[nitrilomethylylidene]}bis(6-methoxyphenolate), has been synthesized and characterized by single-crystal X-ray diffraction. There is a good agreement between calculated and experimental structural data. The complex is crystallized in orthorhombic with space group Pbca. The Mn1 atom is coordinated with one Schiff base ligand, one water molecule and one chloride anion, forming a six-coordination number. The electronic and fluorescence spectra of the complex were also studied. 相似文献
2.
Saleh MI Kusrini E Mohd Sarjidan MA Abd Majid WH 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2011,78(1):52-58
A mononuclear of [Eu(NO3)(Pic)(H2O)2(EO3)](Pic)·(0.73)H2O complex, where EO3=trietraethylene glycol and Pic=picrate anion, shows a red emission when used as an active layer in a single layer of ITO/EO3-Eu-Pic/Al configuration. The crystal structure of the complex consists of [Eu(NO3)(Pic)(H2O)2(EO3)]+ cation and [Pic]- anion. The Eu(III) ion is coordinated to the 10 oxygen atoms from one EO3 ligand, one Pic anion, one nitrate anion, and two water molecules. The complex is crystallized in triclinic with space group P-1. The hybrids in thin films I and II were prepared in the respective order solution concentrations of 15 and 20 mg/mL the emissive center. Comparing the photoluminescence (PL) and electroluminescence (EL) spectra, we can find that all emissions come from the characteristic transitions of the Eu(III) ion. The EL spectra of both thin films showed the occurrence of the most intense red-light emission around at 612 nm. Comparison of organic light-emitting device (OLED) current intensity characteristics as a function of voltage (I-V) show that the thin film I is better than those found for the thin film II. The thickness of the emitting layer is an important factor to control the current-voltage curve. The sharp and intense emission of the complex at low voltage indicates that the complex is a suitable and promising candidate for red-emitting materials. 相似文献
3.
Molina FD Bertollo EM Assis CM Falleiros LR Campos SG Maniglia JV Taboga SR 《Micron (Oxford, England : 1993)》2008,39(7):910-914
Squamous cell carcinoma of the tongue is one of the most common head and neck cancer. Treatment in the early stages is still controversial. This study aims to correlate the apoptosis rate of primary tongue cancer with cervical node metastasis, found in the histopathological studies of specimens obtained from neck dissections or during clinical follow-up. Twenty patients, 65% males, mean age 64.5 years, without clinical evidence of cervical metastasis was included. Eighty-five percent were smokers and 40% were alcohol abusers. Mann-Whitney test was used for statistical analysis (p=0.05). Five patients with clinically occult cervical metastases had metastasis in the histopathological specimens (25%) occult metastasis. The mean apoptosis rate in patients without cervical metastasis was 9.43%. Twenty-five percent of the patients had occult cervical metastasis. High apoptosis rate in tongue cancer, even in the absence of palpable neck nodes, correlates with the presence of occult metastasis. 相似文献
4.
Eny?KusriniEmail author Muhammad?I.?Saleh Anwar?Usman 《Journal of chemical crystallography》2011,41(2):87-97
Abstract
The crystal structure and photoluminescence (PL) studies of the monomeric and dimeric Er(III) complexes with two different chelating ligands (anthracene-9-carboxylic acid, 9-ACA; pentaethylene glycol, EO5; and picric acid, HPic) are reviewed. The Er(III) metal ion was coordinated to the attached ligands in eight- and nine-coordination number. The dimeric [Er2(9-AC)6(DMF)2(H2O)2] complex shows the presence of deprotonated 9-AC anions with the negatively charged oxygen atoms bridged two Er(III) ions leads to a great coordinative flexibility via three possibilities of coordination modes, i.e. monodentate, chelation bidentate, chelating–bridging tridentate, where 9-AC = anthracene-9-carboxylate anion. The monomeric [Er(Pic)2(EO5)](Pic) complex displays the important flexible structure of the acyclic EO5 ligand and the role of Pic anions act as bidentate and monodentate chelations. The PL spectra of both Er(III) complexes show a broad band with the center peak position being dependent on the attached aromatic ligands. The heavier lanthanide complexes show the difference in structures, coordination geometry environment, and luminescence properties compared to the lighter lanthanide complexes. The energy transfer process in the complexes could be optimized with maximize the overlap between the emission spectrum of donor atom and absorption spectrum of acceptor atom. 相似文献5.
Muhammad?I.?SalehEmail author E.?Kusrini R.?Adnan Ismail?A.?Rahman B.?Saad A.?Usman H.?-K.?Fun B.?M.?Yamin 《Journal of chemical crystallography》2005,35(6):469-475
[Bis-picrate(pentaethylene glycol)]praseodymium(III) picrate, [Pr(pic)2⋅(EO5]+[pic]−, was successfully obtained from the reaction of praseodymium nitrate hexahydrate, picric acid and pentaethylene glycol in acetonitrile–methanol as solvent. The crystal system is monoclinic with space group P21/c, a = 18.91419(11) Å, b = 9.0470(6) Å, c = 24.1209(14) Å and α = γ = 90∘, β = 109.07(1)∘, V = 3880.3(4) Å3 and Z = 4. The Pr atom is coordinated to the flexible and open EO5 ring via all the six oxygen atoms and two picrate ligands, one via phenoxo oxygen atom and the other one with both phenoxo and nitro oxygen atoms in a bidentate manner resulting a 9-coordinate tricapped trigonal prismatic geometry. The two picrate ligands coordinated to the Pr atom are at the opposite sides of the hexadentate EO5 ring with phenyl fragments almost perpendicular with dihedral angle of 89.7(3)∘. Thermal analysis results show that the complex is stable up to 100∘C when it began to slowly decompose and followed by an explosive decomposition at 290∘C. 相似文献
6.
Eny Kusrini Muhammad I. Saleh Rohana Adnan Hoong K. Fun M. A. Adhha Abdullah 《Journal of inclusion phenomena and macrocyclic chemistry》2012,74(1-4):425-436
The ternary complexation of neodymium(III) and samarium(III) with triethylene glycol (EO3) and picrate anion (Pic) were characterized by elemental analyses, FTIR (Fourier-transform infrared) spectroscopy, single crystal X-ray diffraction, and photoluminescence (PL). Both the [Nd(Pic)(H2O)2(NO3)(EO3)](Pic) and [Sm(Pic)(H2O)2(NO3)(EO3)](Pic)·H2O complexes were isostructural with a ten-coordination number. In both complexes, the picrate and nitrate anions were coordinated to Ln(III) in a bidentate manner, and with the the EO3 ligand in a tetradentate manner, the addition of two water molecules maintained a ten-coordination number. The lighter lanthanide-picrate complexes formed a ten-coordination number due to the lanthanide contraction effect, acyclic polyether chain length, and number of donor oxygen atoms. The acyclic EO3 ligand affected photoluminescent intensity and its conformation on the structure of the [Ln(Pic)(NO3)(H2O)2(EO3)]+ moiety. Photoluminescent measurement showed complex Nd(III) emissions at 403, 486, and 682?nm, with the strongest emission peak at 403?nm. Formation of these peaks occurred due to the intraligand π–π transitions of the Pic anion. The Sm(III) complex exhibited the emission characteristic of the Sm(III) ion in the red spectral region at 616.7?nm (4G5/2 → 6H9/2 transition), even though the ligand emissions were also observed in the PL spectrum. The emission intensity of the 4f–4f transitions in the Sm complex was significantly higher than that found in its salt. We noted that the [Sm(Pic)(H2O)2(NO3)(EO3)](Pic)·H2O complex was an excellent red-light-emitter and would be considered as a candidate material for organic light emitting diodes. 相似文献
7.
Eny Kusrini Muhammad Idiris Saleh Claude Lecomte 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2009,74(1):120-126
1H NMR evidence for direct coordination between the Ln(III) ion and the oxygen atoms of the pentaethylene glycol (EO5) ligand and the picrate anion (Pic) in [Ln(Pic)2(EO5)][Pic] {Ln = Ce and Nd} complexes are confirmed by single X-ray diffraction. No dissociation of Ln–O bonds in dimethyl sulfoxide-d solution was observed in NMR studies conducted at different temperatures ranging 25–100 °C. The Ln(III) ion was chelated to nine oxygen atoms from the EO5 ligand in a hexadentate manner and the two Pic anions in each bidentate and monodentate modes. Both compounds are isostructural and crystallized in monoclinic with space group P21/c. Coordination environment around the Ce1 and Nd1 atoms can be described as tricapped trigonal prismatic and monocapped square antiprismatic geometries, respectively. The crystal packing of the complexes have stabilized by one dimensional (1D) chains along the [0 0 1] direction to form intermolecular O–HO and C–HO hydrogen bonding. The molar conductance of the complexes in DMSO solution indicated that both compounds are ionic. The complexes had a good thermal stability. Under the UV-excitation, these complexes exhibited the red-shift emission. 相似文献
8.
Eny Kusrini Muhammad I. Saleh Rohana Adnan Yoki Yulizar Ng Sha Shiong H.K. Fun M.A. Adhha Abdullah Mazidah Mamat N.K. Za’aba W.H. Abd. Majid 《Journal of luminescence》2012,132(1):91-99
A new europium complex [Eu(Pic)2(H2O)(EO4)](Pic)·0.75H2O was synthesized and used as the emission material for the single layer device structure of ITO/EO4–Eu–Pic/Al, using a spin-coating technique. Study on the optical properties of the [Eu(Pic)2(H2O)(EO4)](Pic)·0.75H2O complex where EO4=tetraethylene glycol and Pic=picrate anion, had to be undertaken before being applicable to the study of an organic light emitting diode (OLED). The electrical property of an OLED using current–voltage (I–V) measurement was also studied. In complex, the Eu(III) ion was coordinated with the EO4 ligand as a pentadentate mode, one water molecule, and with two Pic anions as bidentate and monodentate modes, forming a nine-coordination number. The photoluminescence (PL) spectra of the crystalline complex in the solid state and its thin film showed a hypersensitive peak at 613.5–614.9 nm that assigned to the 5D0→7F2 transition. A narrow band emission from the thin film EO4–Eu–Pic was obtained. The typical semiconductor I–V curve of device ITO/EO4–Eu–Pic/Al showed the threshold and turn on voltages at 1.08 and 4.6 V, respectively. The energy transfer process from the ligand to the Eu(III) ion was discussed by investigating the excitation and PL characteristics. Effect of the picrate anion on the device performance was also studied. 相似文献
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10.
The title compound, [Dy(NO3)3(bipy)2], is isostructural with the La, Pr, Nd, Eu and Lu analogues where bipy=2, 2′-bipyridyl. The Dy complex was crystallized in orthorhombic with space group Pbcn. The Dy(III) ion was coordinated with the two bipy ligands and three nitrate anions giving a ten coordination number. Measurements of the molar conductance in ethanol and water solutions indicate that the complex is non-electrolyte. A comparative study of the emission of [Dy(NO3)3(bipy)2] complex with those of the adduct mixture of bipy and Dy at a 1:1 ratio, has been investigated. In the solid state, photoluminescence (PL) spectrum of the complex had sharp emission bands corresponding to the 4F9/2→6H15/2 (476.5 and 482 nm), 4F9/2→6H13/2(572.6 and 573.8 nm), 4F9/2→6H11/2 (661.6 nm) and 4H3/2→6H15/2 (961.0 nm) transitions. The hypersensitive peak of the complex has the yellow emission stronger than the blue emission in the solid state as well as in the solution. The complex has a good thermal stability due to the role of π-π interactions stacking. 相似文献