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Kang, Jun-Gill,Kang, Hee-Jung,Jung, Jae-Sun,Yun, Sock-Sung,Kim, Chong-Hyeak Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.6
Crystal structures of lanthanide complexes with NTA (NTA = nitrilotriacetate) are reported. The complexes of $[Ln(NTA)_2{\cdot}H_2O]^{3-}$ (Ln = Sm, Eu, Gd, Tb and Ho) crystallize in the orthorhombic space group Pccn. In the structures, the trivalent lanthanide ions are completely encapsulated via coordination to the two nitrogen atoms and the six carboxylate oxygen atoms of the two NTA ligands, and one water oxygen atoms. The complexes form a slightly distorted capped-square-antiprism polyhedron. Of the complexes, $[Eu(NTA)_2{\codt}H_2O]^{3-}$,\;[Tb(NTA)_2{\cdot}H_2O]^{3-}\;and\;[Dy(NTA)_2{\cdot}H_2O]^{3-}$ excited at the 325 He-Cd line produce very characteristic luminescence features, arising mostly from the f ${\to}$ f transitions. The absolute quantum yields of these complexes are determined at room temperature. Surprisingly, the $[Dy(NTA)_2{\cdot}H_2O]^{3-}$ complex is more luminescent than the $[Eu(NTA)_2{\cdot}H_2O]^{3-}\;and\;[Tb(NTA)_2{\cdot}H_2O]^{3-}$ complexes.
Kang, Jun-Gill,Kim, Tack-Jin,Park, Kwan-Soo,Kang, Sung-Kwon Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.3
A novel Er(III) complex with oxydiacetate and 1,10-phenanthroline was synthesized and its structure and luminescence properties were characterized. The complex of $[Er(ODA){\cdot}(phen){\cdot}4H_2O]^+$ crystallizes in the monoclinic space group $P2_1$/n with a = 12.216(4) ${\AA}$, b = 16.680(2) ${\AA}$, c = 12.627(3) ${\AA}$, ${\beta}=108.30(2)^{\circ}$, V = 2442.7(11) ${\AA}^3$, Z = 4 and ${\rho}=1.841 g/cm^3$. When the complex is excited at the He-Cd 325-nm line, it produces two broad bands spanning the regions 350-650 nm and 1200-1650 nm. The emission band of the complex is characterized by a series of spectral dips in the visible emission profile. The complex exhibits sensitized near- IR emission via two kinds of energy transfers from phen to Er(III): nonradiative and radiative energy transfers.
Structural and Optical Properties of a Pd(II) Complex with 1-Nonyl-3,4-bis(methylthio)pyrrole
Kang, Jun-Gill,Cho, Hyung-Kook,Park, Chang-Moon,Kang, Sung-Kwon,Kim, In-Tae,Lee, Sang-Woo,Lee, Ha-Hyeong,Lee, Young-Nam,Cho, Sang-Hee,Lee, Joo-Hyoung,Lee, So-Ha Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.3
Kang, Jun-Gill,Cho, Dong-Hee,Park, Changmoon,Kang, Sung Kwon,Kim, In Tae,Lee, Sang-Woo,Lee, Ha-Hyeong,Lee, Young-Nam,Lim, Dae-Won,Lee, Sung-Jae,Kim, Sung-Ho,Bae, Young-Ju Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.3
The complexes Pd(nbmtp)Cl2 and Pt(nbmtp)Cl2 (nbmptp = 1-nonyl-3,4-bis(methylthio)pyrrole) were prepared and their x-ray structures were determined at room temperature. The four-coordinated metal unit and the pyrrole ring formed a nearly planar geometry. The free ligand dissolved in CH2Cl2 produced two luminescence bands associated with the lone-pair electron of S (l max = 525 nm) and the pyrrole p electron (l max = 388 nm). When the two complexes were dissolved in CH2Cl2, these two luminescence bands were also observed, although the low-energy band was blueshifted. For the crystalline Pt(II) complex, only the strong charge transfer band (l max = 618 nm) from the d* orbital of Pt resulted from excitation of the lone-pair electron of S.
Kang, Jun-Gill,Oh, Sung-Il,Cho, Dong-Hee,Nah, Min-Kook,Park, Chang-Moon,Bae, Young-Ju,Woo, Tack-Han,Park, Young-Jin,Lee, Sang-Woo,Kim, In-Tae Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.5
Complexes of Pd(btnbmtp)$Cl_2$ and Pt(btnbmptp)$Cl_2$ (btnbmtp = 2,5-bis(thiophen)-1-nonyl-3,4-bis(methylthio)- pyrrole) were prepared and their crystal structures were determined at room temperature. In the structures, the two thiophene moieties lie in cis form with an average dihedral angle of $55.26^{\circ}$ to the pyrrole frame. The luminescence properties of the free ligand and the complexes were investigated in solution and solid states. The luminescence of the compounds were not favored by substituting thiophene moieties to the pyrrole frame, compared to the unsubstituted nbmptp (nbmptp = 1-nonyl-3,4-bis(methylthio)pyrrole). In particular, thiophene substitution quenched the emission from the complexes dissolved in ,$CH_2Cl_2$ and reduced the charge transfer transitions from S atoms of the thio moieties to Pt in crystalline state, which was very characteristic of Pt(nbmptp)$Cl_2$.
Polarization of the A-Band Emission from RbCl : Pb$^{2+}$
Kang, Jun-Gill Korean Chemical Society 1987 Bulletin of the Korean Chemical Society Vol.8 No.2
The angular dependence of polarization of the A-band emission from RbCl:$Pb^{2+}$ is measured at 13.4 K to determine the symmetry axes of the $Pb^{2+}-v^-_c$ dipoles. The results indicate that these centers posess tetragonal symmetry. This implies that $v^-_c$ is situated in the next-nearest-neighbor (nnn) position to the $Pb^{2+}$ ion. The polarization ratio of the A-band emission measured at various temperatures is found to be independent of the temperature. The temperature independence of polarization confirms that, for the ?$Pb^{2+}$ ion, the Jahn-Teller effect reduced by strong spin-orbit interaction does not give rise to thermal depolarization.
Physicochemical properties of praseodymium hydroxide and oxide nanorods
Kang, Jun-Gill,Min, Bong-Ki,Sohn, Youngku Elsevier 2015 JOURNAL OF ALLOYS AND COMPOUNDS Vol.619 No.-
<P><B>Abstract</B></P> <P>We synthesized hexagonal phase Pr(OH)<SUB>3</SUB> nanorods by a hydrothermal method and obtained cubic phase Pr<SUB>6</SUB>O<SUB>11</SUB> by post-thermal annealing at above 550°C. Pr(OH)<SUB>3</SUB> nanorod growth was found to occur in the [001] direction. Upon thermal annealing, the oxidation state of Pr(III) was changed to Pr(III, IV). The physicochemical properties were fully examined by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) crystallography, UV–Visible–NIR absorption, differential scanning calorimetry/thermogravimetric analysis (DSC/TGA), X-ray photoelectron spectroscopy (XPS), and temperature-programmed reduction (TPR) and CO oxidation activity tests.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pr(OH)<SUB>3</SUB> nanorods were synthesized by a hydrothermal method. </LI> <LI> Pr<SUB>6</SUB>O<SUB>10</SUB> nanorods were obtained by a post-annealing method. </LI> <LI> Pr(III) changed to Pr(IV) after annealing. </LI> <LI> The physicochemical properties were fully examined. </LI> <LI> Hydrogen reduction and CO oxidation profile were newly revealed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kang, Dae-Gill,Sohn, Eun-Jin,Kim, Jin-Sook,Lee, Yun-Jung,Moon, Mi-Kyoung,Lee, An-Sook,An, Jun-Seok,Lee, Ho-Sub The Physiological Society of Korean Medicine and T 2006 동의생리병리학회지 Vol.20 No.5
Hypercholesterolemia is a pivotal pathogenic factor for the development and maintenance of atherosclerosis. The present study was designed to evaluate whether the methanol extract of Sorbus commixta cortex (MSC) restores vascular dysfunction in association with the aortic expressions of proinflarnmatory and adhesion molecules in high cholesterol (HC) diet-rats. Chronic treatment with low (100 mg/kg/day) or high doses (200 mg/kg/day) of MSC lowered the increase in plasma levels of triglyceride (TG) and low-density lipoprotein (LDL) cholesterol induced by a cholesterol-enriched diet without affecting on the plasma level of high density lipoprotein (HDL)-cholesterol. Vascular tone attenuated in the HC-diet rats was restored by administration with MSC. Treatment with MSC also suppressed the HC-induced increase in the monocyte chemoattractant protein-1 (MCP-1) and nuclear factor-$_K$B (NF-$_K$B) p65 expressions as well as expressions levels of adhesion molecules including intercellular adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule-1 (ICAM-1), and E-selectin in aorta. The present study also showed that MSC inhibited the HC-mediated induction of ET-1 and ACE expression. In histopathological examination, aortic segments in the HC-diet rat revealed thickening intima and media, which were blocked by administration with MSC. Taken together, MSC could suppress the development of atherosclerosis in the HC-diet rat model through the inhibition of the aortic expression levels of pro-inflammatory and adhesion molecules.
Kang, Dae Gill,Cao, Li Hua,Lee, Jun Kyoung,Choi, Deok Ho,Kim, Seung Ju,Lee, Hyuck,Kim, Jin Sook,Lee, Ho Sub Institute for Advanced Research in Asian Science a 2006 The American journal of Chinese medicine Vol.34 No.4
<P>The butanol extract of Phellinus igniarius (BPI) induced relaxation of the phenylephrin e-precontracted rat aorta in a dose-dependent manner, and its effect was abolished by the removal of functional endothelium. Pretreatment of the aortic tissues with N(G)-nitro-L-arginine methyl ester (L-NAME), methylene blue, or 1H-[1,2,4]-oxadiazole-[4,3-alpha]-quinoxalin1-one (ODQ) inhibited the vascular relaxation induced by BPI. BPI-induced vascular relaxations were also markedly attenuated by the addition of verapamil or diltiazem, while the relaxant effect of BPI was not blocked by pretreatment with indomethacine, glibenclamide, tetraethylammonium (TEA), atropine, or propranolol. Incubation of endothelium-intact rat aorta with BPI increased the production of cGMP in a dose-dependent manner. These results suggest that BPI dilates vascular smooth muscle via endothelium-dependent nitric oxide-cGMP signaling pathway, with the possible involvement of L-type Ca(2+) channels.</P>