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Noh, Tae Hwan,Kim, Shin A,Lee, Su Yeon,Jung, Ok-Sang WILEY-VCH Verlag 2009 European journal of inorganic chemistry Vol.2009 No.29
<P>An unprecedented modulation of submicrohelix versus submicrostick morphologies by sonication has been systematically carried out on new propeller-type tri-O-isonicotinoylphloroglucinol. The formation and control of uniform submicrohelix and submicrostick morphologies show subtle external sonication media effects. The first control of submicrohelices versus submicrosticks by sonication without any additive or template seems to be a function of conformational isomers. The facile loading of PdCl<SUB>2</SUB> nanoparticles from K<SUB>2</SUB>PdCl<SUB>4</SUB> on the morphologies is a conceptually advanced method of nanoparticle–submicromorphology interaction.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)</P> <B>Graphic Abstract</B> <P>For tri-O-isonicotinoylphloroglucinol, the formation and control of uniform helix and stick morphologies shows subtle external sonication media effects. The first control of submicrohelices versus submicrosticks by sonication without any additives seems to be a function of conformational isomers. The present approach to loading PdCl<SUB>2</SUB> nanoparticles from K<SUB>2</SUB>PdCl<SUB>4</SUB> on the morphologies is a conceptually advanced method of metal-surface–donor interaction. <img src='wiley_img/14341948-2009-2009-29-30-EJIC200900698-fig000.gif' alt='wiley_img/14341948-2009-2009-29-30-EJIC200900698-fig000'> </P>
Recent Advances in Various Metal–Organic Channels for Photochemistry beyond Confined Spaces
Noh, Tae Hwan,Jung, Ok-Sang American Chemical Society 2016 Accounts of chemical research Vol.49 No.9
<P>Tailor-made molecular channel architectures are a hot issue in the fields of nanotechnology, molecular sieves, ion sensors, recognition, confined space reactors, and fluidic transport systems. Carbon nanotubes have been a particular focus, though they cannot easily be synthesized to predefined structures and sizes. Rational design and construction of molecular channel structures based on coordination chemistry has been recognized as a useful approach. Metalorganic channel (MOC) structures can be generated by utilizing, at least in principle, molecular self-assembly of metal ions as angular units with designed ligands as spacers. Recent developments in molecular channel chemistry include exciting advances in photochemical applications and supramolecular material functionality, in addition to general applications such as transport, diffusion and exchange, separation, gas storage, catalysis, and simple encapsulation. In order to carry out the diverse channel functionalities, a large number of studies have been conducted on the synthesis of robust and stable 3D coordination polymers, which show permanent porosity without any guest molecules within the channels, in that the robustness of the channel structures after removal of the solvate/guest molecules is of interest because the structural integrity of the extended structures must be maintained during the reactions. These compounds can be regarded as analogous to zeolites. This Account highlights advances in the construction, from metal cations and multidentate pyridyl ligands, of various MOCs and useful molecular materials as photoreaction platforms. We begin by discussing the fact that detailed proof-of-concept construction of various systematic MOC structures has been introduced mainly in terms of the metal ions as angular components and the pyridyl ligands as spacers. This approach leads to structural complexity of assembled MOC motifs such as metallamacrocycles, helical and cylindrical coordination polymers, vertical arrays of 1D coordination polymers, interweaving and eclipsed stacking of 2D coordination polymers, and typical 3D coordination polymers. Notwithstanding the diversity of their skeletal structures, confined spaces of the channels are suitable for the study of photochemical performances including radical trapping, photocyclopropanation, dye inclusion and energy transfer, and guest-to-host structural transmission. The key aspect of their utility is not only the preparation of photoresistant MOCs but also channel tuning for inclusion of photoactive guests. Guest molecules, which are compatible with the size, shape, and polarity of the channels, can be incorporated into the crystals, instead of simple organic solvents, thus giving rise to hostguest complexes in the solid state. Such MOC studies could facilitate the development of chemical sensors, new photocatalytic systems, and useful molecular photochemical reactors.</P>
Noh, Tae Hwan,Lee, Young-A,Jung, Ok-Sang WILEY-VCH Verlag 2010 European journal of inorganic chemistry Vol.2010 No.1
<P>Stepwise syntheses of monometallic palladium(II) and bimetallic palladium(II)/platinum(II) complexes were carried out in order to measure the metallophilicity of potential tetradentate bis(alkylthio)ylidenemalonato ligands. The reaction of [Pd](SO<SUB>4</SUB>) ([Pd] = (Me<SUB>4</SUB>en)Pd; Me<SUB>4</SUB>en = N,N,N′,N′-tetramethylethylenediamine) with Ba[L] {L: bis(methylthio)methylenepropanedioato (1); bis(ethylthio)methylenepropanedioato (2); 1,3-dithiapan-2-ylidene-malonato (3)} produced [[Pd]-O,O′-L]. Successive reactions of [[Pd]-O,O′-L] with {M}(NO<SUB>3</SUB>)<SUB>2</SUB> ({M} = (en)M; en = ethylenediamine; M = Pd<SUP>II</SUP>, Pt<SUP>II</SUP>), followed by anion exchange with PF<SUB>6</SUB><SUP>–</SUP>, yielded banana-shaped bimetallic complexes [[Pd]-O,O′-L-S,S′-{M}](PF<SUB>6</SUB>)<SUB>2</SUB>. In case of [[Pd]-O,O′-1], the bis(alkylthio)methylene group of 1 was bent strikingly from the palladium square plane (dihedral angle = 78.26°), in contrast to the cases of [[Pd]-O,O′-3] (120.84°) and [[Pd]-O,O′-L-S,S′-{M}](PF<SUB>6</SUB>)<SUB>2</SUB> (101.75–103.54°). [[Pd]-O,O′-L] (L = 1, 2) in Me<SUB>2</SUB>SO existed as a mixture of [[Pd]-O,O′-L] and [(Me<SUB>4</SUB>en-N)(Me<SUB>2</SUB>SO-S)-Pd-O,O′-L] in a mol ratio of 1:1. For the labile species, a linkage isomeric equilibrium between [[Pd]-O,O′-L] and [[Pd]-O,S-L] in D<SUB>2</SUB>O was observed. [[Pd]-O,O′-3] and [[Pd]-O,O′-L-S,S′-{M}](PF<SUB>6</SUB>)<SUB>2</SUB>, however, were found to be inert in Me<SUB>2</SUB>SO or D<SUB>2</SUB>O. Such notably different solution behavior possibly can be explained by the steric hindrance occurring via the dihedral angles between the palladium square plane and the ylidene moiety. Variable-temperature <SUP>1</SUP>H NMR spectra of the banana-shaped bimetallic complexes [[Pd]-O,O′-L-S,S′-{M}](PF<SUB>6</SUB>)<SUB>2</SUB> in CD<SUB>3</SUB>CN solution revealed that the amine proton resonances are sensitive to the fluxional motion of the remote bis(alkylthio)ylidene groups, suggesting the occurrence of interconversion between the two “bent-up” and “bent-down” forms.</P> <B>Graphic Abstract</B> <P>Stepwise syntheses of monometallic palladium(II) and bimetallic palladium(II)/platinum(II) complexes containing a series of potential tetradentate (O,O′,S,S′) ligands were carried out. Pd<SUP>II</SUP> favored the O,O′-chelate whereas Pt<SUP>II</SUP> favored theS,S′-chelate in the solid state. Notably different solution behavior due to the steric hindrance between the palladium square plane and the ylidene moiety were observed. <img src='wiley_img/14341948-2010-2010-1-EJIC200900804-fig000.gif' alt='wiley_img/14341948-2010-2010-1-EJIC200900804-fig000'> </P>
Noh, Tae Hwan,Jang, Jaeseong,Hong, Woosik,Lee, Haeri,Jung, Ok-Sang The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.56
<P>Research on the construction, crystal morphology, and functions of a novel zeolite L-mimic metal–organic framework (ZLMOF) was carried out. Treatment of the tubular crystals with AgBF<SUB>4</SUB> in acetone at 40 °C smoothly coated the surface of the ZLMOF crystals with silver(0) nanoparticles.</P> <P>Graphic Abstract</P><P>Construction, crystal morphology, surface coating, and functions of a novel zeolite L-mimic metal–organic framework consisting of [Ag<SUB>4</SUB>Ni(L)<SUB>3</SUB>]·3.5H<SUB>2</SUB>O have been investigated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc03097d'> </P>
Noh, Tae Hwan,Lee, Haeri,Jang, Jaeseong,Jung, Ok‐,Sang WILEY‐VCH Verlag 2015 Angewandte Chemie Vol.127 No.32
<P><B>Abstract</B></P><P>The self‐assembly of Zn<SUP>II</SUP> ions with 1,3,5‐tris(isonicotinoyloxyethyl)cyanurate produces new topological (4<SUP>2</SUP>⋅12<SUP>4</SUP>)<SUB>3</SUB>(4<SUP>3</SUP>)<SUB>4</SUB> 2D metal–organic frameworks (MOFs) with anion‐confining cages. The eclipsed assembly of each 2D MOF by π–π stacking of cyanurate moieties (3.352(5) Å) forms 3D MOFs consisting of nanochannels (10.5 Å). Two of the three anions are confined in each peanut‐type cage, resulting in hydrophobicity of the nanochannels. The hydrophobic nanochannel effectively adsorbs a wide range of fused aromatic hydrocarbons (FAHs) as monomers or dimers, rendering it potentially highly useful as an energy‐transfer material.</P>
Noh, Tae-Hwan,Lee, Jung-Woon,Lee, Young-A,Lee, Ji-Eun,Lee, Shim-Sung,Jung, Ok-Sang Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.3
Reaction of AgNO3 with triethanolaminetriisonicotinate (L) produces 1 D coordination polymer of [Ag3(L)2](NO3)3 and the same treatment of Cu(NO3)2 with L gives 1D coordination polymer of [Cu(L)2](NO3)2. The nonrigid triethanolaminetriisonicotinate acts as a m 3-bridged tridentate for [Ag3(L)2](NO3)3 and a m 2-bridged bidentate for [Cu(L)2](NO3)2 to produce unusual motifs. The NO3- anions can be smoothly exchanged by PF6- anions in an aqueous suspension without destruction of the skeletal structure.