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Formation and Related-Behavior of Micro-bowl Morphology Consisting of Ionic Palladium(II) Complexes
Cho Rong Kim,Chi Won Kim,노태환,이영아,Jongki Hong2,,정옥상 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.8
Reaction of [(bpy)Pd](PF6)2 (bpy = 2,2'-bipyridine) with racemic bis(isonicotinoyl)-1,1'-bi-2-naphtholate (L) in acetone,and followed by addition of chloroform and solvent evaporation allows to form amorphous micro-bowl morphology consisting of [(bpy)PdL]2(PF6)4 without any template or additive. In contrast, the reaction and recrystallization in acetone for 1 week produce parallel-piped single crystals consisting of [(bpy)3Pd3(μ3-HPO4)2](PF6)2. The formations of micro-bowl and parallel-piped single crystal morphologies appear to be primarily associated with the kinetic and thermodynamic control, respectively. The formation of micro-bowls may be attributed to eruption of organic solvents. Cosolvent effects and chemical properties on the formation of micro-bowl morphology have been observed.
A New 5α,8α-Epidioxy Sterol from a Marine Sponge Psammocinia Species
Hye Jin Park1,,Xuan Luo1,,Jongki Hong2,,Dong-kyoo Kim3,,Kwang Sik Im1, and,Jee H. Jung1* 한국생약학회 2005 Natural Product Sciences Vol.11 No.4
An investigation of the MeOH soluble fractions of a marine sponge Psammocinia sp. (Order:Dictyoceratida) led to the isolation of a new epidioxy sterol (1) and four known sterols (2-5). Their planarstructures were defined by analyses of the spectroscopic data. The 27-nor-24-methylcholestan type side chain withan epidioxy nucleus (1) was unprecedented. Compounds 1-5 were isolated from a sponge Psammocinia sp. for the first time.