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Beryllium(II) Recognition by Allosteric Effects in 1,2-Ethylenedioxybenzene Based Ditopic Receptors
김동완,Junghwan Kim,황재영,최명룡,김재상 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.8
Efficient ditopic receptor, uranyl(II) N,N'-(ethylenedioxy)benzenebis(salicylideneimine) (3) for beryllium ion has been obtained upon functionalization of 1,2-ethylenedioxybenzene (1) with a uranyl-salphen (salphen =N,N'-phenylenebis(salicylideneimine)) unit. Binding affinities of the receptor, 3 in AN-DMSO (v/v 95:5)solution have been measured for alkali and alkaline earth metal ions by conductometry comparing 1. The results showed that both monotopic 1 and ditopic receptor 3 were selective for Be^(2+) ions over other cations,while especially 3 that can complex both with cations (coordinated to basic oxygen of ethylenedioxybenzene)and anions (coordinated to the Lewis acidic uranyl center) results in an increase of the stability constants by a factor of 10^(2.42) with respect to 1. Furthermore, the Be^(2+)-3 interactions are demonstrated by ^1H NMR experiments in highly polar solvent medium, DMSO-d_6. Higher selectivities were also observed for Be^(2+) when the ditopic receptor, 3 was incorporated into PVC membranes and tested as ion selective electrodes at neutral pH.
Organopalladium(II) Complexes as Ionophores for Thiocyanate Ion-Selective Electrodes
김동완,So Hyun Lee,Junghwan Kim,Jineun Kim,Jae Sang Kim,Jong Keun Park 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.10
A thiocyanate poly(vinyl chloride) (PVC) membrane electrode based on [1,2-bis(diphenylphosphino)ethane]dihalopalladium(II), [(dppe)PdX2, X = Cl (L1), X = I (L2)] as active sensor has been developed. The diiodopalladium complex, [(dppe)PdI2](L2) displays an anti-Hofmeister selectivity sequence: SCN‒ > I‒ > ClO4‒ > Sal‒ > Br‒ > NO2- >HPO4‒ > AcO‒ > NO3‒ > H2PO4 ‒ > CO3 2‒. The electrode exhibits a Nernstian response (-59.8 mV/decade) over a wide linear concentration range of thiocyanate (1.0 × 10-1 to 5.0 × 10-6 M), low detection limit (1.1 × 10-6 M), fast response(t90% = 24 s), and applicability over a wide pH range (3.5∼11). Addition of anionic sites, potassium tetrakis[p-chlorophenyl] borate (KTpClPB) is shown to improve potentiometric anion selectivity, suggesting that the palladium complex may operate as a partially charged carrier-type ionophore within the polymer membrane phase. The reaction mechanism is discussed with respect to UV-Vis and IR spectroscopy. Application of the electrode to the potentiometric titration of thiocyanate ion with silver nitrate is reported.
오디용 뽕나무 시설재배 수형별 뽕잎생산량과 누에 사육량 분석
김동완,문형철,김은지,김정만 한국유기농업학회 2015 韓國有機農業學會誌 Vol.23 No.4
This study was considered chances of additional income, if farmers raised silkworms in unused mulberry leaves, after harvesting mulberry, investigated yields of mulberry leaves in vinyl-house and optimal amount in raised silkworms, First, the results was investigated productions of mulberry leaves in the mulberry tree-shape of vinyl-house, T-shape harvested 7.07 kg, Y-shape was 6.55 kg, in comparison with convention of it was harvested 4.75 kg mulberry leaves/1 mulberry tree, was harvested 49%, 38% more each. Also, yields of mulberry leaves was used 302 kg when was raised 1box of silkworms in the mulberry tree-shape of vinyl-house. In other hand, yields of raising silkworms was analysed in the mulberry tree-shapes of vinyl-house, mulberry leaves of 1,000 ㎡ vinyl-house mulberry tree was raised average of 3.74 boxs silkworms, in the concrete conventional-shape was 3.24 boxs, T-shape did 4.17 boxs and Y-shape was 3.83 boxs, Consequently, if the farmers of 1,000 ㎡ vinyl-house mulberry tree raised silkworms with unused mulberry leaves, could get 1~1.2 million won additionally.