Myungkoo Suh

A three-dimensional cobalt(II)-coordination polymer based on 3,5-pyridinedicarboxylate

Abstract Hydrothermal reaction between cobalt(II) nitrate and 3,5-pyridinedicarboxylic acid in the presence of NaOAc and NaCl gave a 3-D cobalt(II)-coordination polymer, Co(3,5-pyridinedicarboxylato)(H 2 O) ( 1 ). X-ray structure determination showed that compound 1 has a 3-D infinite network based on cobalt–carboxylate building blocks.

Mesoporous Titania Thin Film with Highly Ordered and Fully Accessible Vertical Pores and Crystalline Walls

We report the preparation of mesoporous titania thin films with the R

A Mesoporous Silica Thin Film as Uptake Host for Guest Molecules with Retarded Release Kinetics

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Heteroleptic binuclear palladium(II) and platinum(II) complexes containing 1,2-bis(diphenylphosphino)acetylene and 1,2-benzenedithiolates: syntheses, crystal structures, electrochemistry and photoluminescence properties

m pore structure derived from the Im

Highly Sensitive and Fast Protein Detection with Coomassie Brilliant Blue in Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis

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Crystal Structure and Spectroscopic Study of Novel Two- and Three-Dimensional Photoluminescent Eu(III)-Adipate Compounds

m self-assembled ordering of the titania species and an EO(106)PO(70)EO(106) triblock copolymer. The films were spin-cast and then aged at 18 degrees C at a relative humidity of 70 %, which led to the orientation of the Im

A Zinc(II)-Carboxylate Coordination Polymer Constructed from Zinc Nitrate and 2,6-Naphthalenedicarboxylate

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Synthesis and characterization of highly crystalline anatase nanowire arrays

m structure with the [111] direction perpendicular to the substrates. The [111] body-diagonal channels became vertical channels upon calcination at 400 degrees C, thus leading to thin films with vertical channels. The pores are ordered over a large area of up to 1 mum(2). The titania films can be formed on various types of substrates. By using a titania film formed on a Pt-coated Si wafer as a template, we produced by an electrochemical-deposition technique arrays of gold nanowires, whose morphology suggests that most of the pores of the titania thin films are accessible. The pore structure of vertical channels is stable up to 600 degrees C, at which temperature the wall materials crystallize into anatase.

Fluorescent Hydrophobic Probes Based on Intramolecular Charge Transfer State for Sensitive Protein Detection in Solution

Uptake and release processes of various fluorescent rhodamine dyes and antitumor drugs to/from an ordered mesoporous silica film are investigated by means of UV/Vis absorption and fluorescence spectroscopies. The pores in the 160 nm-thick silica film strongly withdraw the dyes from water, thus allowing the storage of several micrograms of guest molecules per square centimeter of film. The binding equilibrium of the dyes follows a Langmuir-type adsorption. The dissociation constant, K(d), and the maximum binding amount to the film, N(ads)(infinity), are determined by fitting the binding curves. The release kinetics of the guests from the film to a simulated body fluid (SBF) solution follows a bimodal first-order exponential behavior. The release kinetics from the mesoporous thin film is remarkably retarded relative to that from mesoporous powders. Among all the studied dyes, rhodamine 101 is released most slowly, which implies that the release rate depends not only on the interactions between the guests and the silica surface, but also on intermolecular interactions between the guest molecules. Comparison of the release kinetics of different antitumor drugs, such as actinomycin D and mitoxantrone, into an SBF solution shows that mitoxantrone is released much slowly. This slower release is attributed to the positive molecular charge and the formation of dimers in the pores.

Highly sensitive and simple fluorescence staining of proteins in sodium dodecyl sulfate-polyacrylamide-based gels by using hydrophobic tail-mediated enhancement of fluorescein luminescence

A series of heteroleptic binuclear Pd(ii) and Pt(ii) complexes, [M(bdts)](2)(micro-dppa)(2) (M = Pd () and Pt (); dppa = 1,2-bis(diphenylphosphino)acetylene = Ph(2)PC[triple bond, length as m-dash]CPPh(2); bdts = 1,2-benzenedithiolate (bdt: a), 3,4-toluenedithiolate (tdt: b) and 1,4-dichloro-2,3-benzenedithiolate (Cl(2)bdt: c), containing two square-planar MP(2)S(2) cores were prepared using (MCl(2))(2)(micro-dppa)(2) (M = Pd () and Pt ()) and the corresponding 1,2-benzenedithiols, and characterized by spectroscopic methods including FT-IR, Raman, UV-vis, MALDI-TOF-MS, (31)P{(1)H} and/or (195)Pt{(1)H} NMR spectroscopy. X-Ray crystal structure analyses for complexes and revealed that C1C2C4C3 is twisted in two ways with a torsion angle of 21.6-30.7 degrees for 3a, 4a, and 4b and about 42 degrees for 3c and 4c, and that their crystals are racemic mixtures. Due to the more electronegative chloride atoms in the ligand, complexes and show higher nu(M-S) vibrational frequencies in their Raman spectra, smaller spin-spin coupling constants (J(Pt-P)) in their (195)Pt{(31)P} NMR spectra and higher anodic potentials (E(pa)) in their cyclic voltammograms than complexes 3a, 3b, 4a and 4b. Moreover, only complex containing the chlorinated ligand and Pt(ii) ion exhibits luminescence (lambda(ob) = 610 nm and lambda(ex) = 440 nm) in the solid state at 298 K. This emissive transition can be assigned as the d-pi(dithiolate) metal-to-ligand charge transfer (MLCT) and the feasibility of this spin-forbidden transition is ascribed to the effective spin-orbit coupling of ligand c containing heavy chloride atoms and the large spin-orbit coupling in Pt(ii).