• 대한화학회지
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• 제54권5호
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• pp.515-522
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• 2010

o-phenylene diamines, dehydroacetic acid (DHA) 및 p-chloro benzaldehyde에서 유도된 세자리 Schiff 염기 리간드인 4-hydroxy-3(1-{2-(benzylideneamino)-phenylimino}-ethyl)-6-methyl-2H-pyran-2-one (HL)의 Cu(II), Ni(II), Co(II), Mn(II) 및 Fe(III) 착물의 형성상수와 항미생물 활성과의 관계를 연구하였다.리간드와 착물은 원소분석, 전도도, 자기수자율, 열분석, X-선 회절, IR, $^1H$-NMR, UV-vis 및 질량 스펙트럼으로 특성조사를 하였다. 분석데이터로부터 착물들의 화학량론비가 1:2 (금속:리간드)임을 알았다. 금속 착물들의 몰 전도도 값은 이들의 비전해질 성질을 의미한다. X-선 회절 데이터에서 Ni(II) 착물은 단사정계 그리고 Cu(II) 및 Co(II) 착물은 삼사정계 결정계임을 규명하였다. IR 스펙트럼 데이터로부터 리간드는 중심금속에 대해 ONN 주개원자 배열의 세자리 리간드로 행동함을 알았다. 열적 행동 (TG/DTA)과 Coats-Redfern 법에 의해 계산한 반응속도 파라메터는 착물형성 과정에서 좀 더 질서 있는 활성화 상태를 제안하고 있다. 착물의 양성자화 상수를 THF:물 (60:40) 용액, $25^{\circ}C$ 및 이온세기 ${\mu}=0.1\;M$ ($NaClO_4$)에서 전위차법으로 측정하였다. Staphylococcus aureu 및 Escherichia coli.에 대한 항박테리아 활성을 시험관에서 조사하였다. 또한 Aspergillus Niger 및 Trichoderma에 대한 항세균 활성도 조사하였다. 금속 이온 및 착물의 안정도가 항미생물학적 활성에 미치는 영향을 고찰하였다.

• Bulletin of the Korean Chemical Society
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• 제23권4호
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• pp.613-616
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• 2002

• 대한화학회지
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• 제43권5호
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• pp.511-516
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• 1999

2-hydroxy-1-naphthaldehyde와 2-aminopyridine으로부터 $N_2O$형의 세자리 Schiff Base 리간드인 (2-hydroxy-1-naphthyllidine)-o-iminopyridine [NOIPH]리간드와 Cobalt(II), Nickel(II) 및 Copper(II) Acetate들과 반응시켜 Schiff Base 전이금속(II) 착물들을 합성하였다. 이 리간드와 전이금속(II)착물들의 구조를 원소분석, IR, UV-vis, NMR 분광법 및 TGA 방법으로 확인하였다. 중심 금속인 전이금속(II) 이온은 $N_2O$형의 주개원자를 갖는 세자리 리간드의 페놀기에 있는 산소와는 이온결합을, 아로매틱 아민의 질소와는 배위결합을 형성하여 비이온성의 착물을 형성하였다. 착물에서 리간드들은 전이금속(II) 이온과 2:I의 몰비로 결합하며 4배위 구조임을 알았다.

• Macromolecular Research
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• 제14권5호
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• pp.539-544
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• 2006

2-Furancarboxaldehyde-2-pyridinylhydrazone (FPH) and 5-methyl-2-furancarboxaldehyde-2-pyridinylhydrazone (MFPH) were synthesized and used as tridentate ligands of copper (I) bromide for the atom transfer radical polymerization of methyl methacrylate (MMA) and styrene. The polymerization of methyl methacrylate achieved high conversion and yielded polymers with a good control of molecular weight and low polydispersity (PDI=1.33). Higher PDI were observed in the polymerization of styrene. Using 1-phenyl ethylbromide (PEBr) and ethyl 2-bromoisobutyrate (EBiB) as model compounds for the polymeric chain ends, the activation rate constants of the new catalytic systems were measured. These results were correlated with the polymerization results and compared with another catalytic system previously reported.

• Bulletin of the Korean Chemical Society
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• 제13권5호
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• pp.507-511
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• 1992

Six-coordinate molybdenum(V) complexes X[MoO$(NCS)_2$(L)], where X=$PyH^+$, $Me_4N^+$, $Et_4N^+$, n-$Bu_4N^+$, and L= the tridentate schiff base dianions derived from the condensation reaction between various salicylaldehydes and 2-aminophenol have been synthesized. The complexes have been characterized by elemental analysis, conductivity, UV-visible, IR, $^1H$-NMR, and mass spectroscopy. The coordination around the molybdenum appears to be distorted octahedral. A tridentate ligand containing the ONO donor atoms occupies meridional positions with the N atom trans to the terminal oxo group. Two NCS ligands bond to the molybdenum through the N atom and are cis to the Mo = $O_t$ group. The electrochemical behaviors of the complexes have also been investigated by cyclic voltammetry in dimethylsulfoxide.

• 대한화학회지
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• 제17권3호
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• pp.169-173
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• 1973

세자리 schiff base리간드로서 salicylidene amino-o-hydroxy benzene 은 salicylaldehyde와 o-amino phenol로서 합성하였으며 이 세자리 schiff base 리간드와 Mo(VI), Mo(V), Mo(IV) 및 Mo(III) 의 과산화상태의 몰리브덴 착물들의 반응으로 새로운 착물[Mo O$_2(H_2O)\;(C_{13}H_9O_2N)]$, [MoO Cl(H$_2O)(C_13H_9O_2N)]$, $[Mo(SCN)_2(H_2O)(C_{13}H_9O2_N)]$ 및 $[Mo(H_2O)_2 (C_{13}H_9O_2N)]_2O$들을 얻었다. 이들 착물에서 Mo(VI), Mo(V) 및 Mo(IV)착물들은 리간드와 몰리브덴의 mole비가 1:1인 착물로서 몰리브덴 이온은 6배위 팔면체로서 주어지나 Mo(III) 착물은 Mo-O-Mo의 산소 bridge bond를 갖는 poly nuclear 착물로서 mole비 1:1인 착물로 주어짐을 원소분석치와 자외선흡광도 및 적외선 spectra의 고찰로서 알아보았다.

• Bulletin of the Korean Chemical Society
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• 제19권1호
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• pp.83-86
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• 1998

The luminescence spectra of Eu(Ⅲ) complexes have been measured as a function of molar metal-to-ligand ratio and pH. The ligands used in this study are tridentate iminodiacetate (IDA) and methyliminodiacetate (MIDA). The 620 nm emission band, attributed to the $^5D_0{\to}^7F_2$ transition, is monitored to investigate the optimum condition for $EuL_3^{3-}$ complex formation in aqueous state. In addition, the sensitivity of the 465 nm absorption band, attributed to the $^7F_0{\to}^5D_2$ transition, to the ligand environment has been also investigated.

• Bulletin of the Korean Chemical Society
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• 제32권8호
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• pp.2537-2543
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• 2011

A self-assembled Al-bridged diiminopyridine-based ligand (3) was synthesized and characterized by FT-IR, ESI-MS and NMR spectroscopy. Electron spectral titrations were performed to confirm the formation of a novel trinuclear bis(imino)pyridyl iron(II) complex (4) upon addition of $FeCl_2$ into Al-bridged ligand 3 in methanol solution. Simultaneously, a typical bis(imino)pyridine-iron(II) complex (2) was synthesized and fully characterized. The X-ray crystal study of the iron(II) complex 2 disclosed a five-coordinate, distorted square-pyramidal structure with the tridentate N^N^N ligand and chlorides. The optimal molecular structure of 4 was obtained by means of molecular mechanics, which showed that each iron atom in the complex 4 is surrounded by two chlorides, a tridentate N^N^N ligand and one oxygen atom, supporting considerations about the possibility of six-coordinate geometry from MMAO or the ethylene access. A comparison of 4 with the reference 2 revealed a remarkable decrease of the catalytic activity and MMAO consumption (activity up to $0.41{\times}10^3\;kg\;{mol_{Fe}}^{-1}h^{-1}bar^{-1}$, Al/Fe = 650 for 4 and $7.02{\times}10^3\;kg\;{mol_{Fe}}^{-1}h^{-1}bar^{-1}$, Al/Fe = 1600 for 2).

• Bulletin of the Korean Chemical Society
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• 제26권1호
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• pp.72-76
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• 2005

Some mononuclear oxovanadium(IV) complexes having the general formula [VOL(bidentate)] (1-4) of which L is tridentate ONS-donor salicylaldehyde S-methyldithiocarbazate (sal-mdtc$^{2-}$) or salicylaldehyde 4- phenylthiosemicarbazate (sal-phtsc$^{2-}$) and bidentate stands for 2,2'-bipyridyl (bpy) or 1,10-phenanthroline (phen) have been synthesized. The complexes were characterized by elemental analyses, FAB mass, UV, IR spectroscopy, and cyclic voltammetry. Two of the complexes [VO(sal-mdtc)(bpy)] (1) and [VO(sal-mdtc) (phen)] (2) were crystallographically characterized. The structures revealed that vanadium atom is octahedrally coordinated by the O, N, and S donor atoms of the tridentate ligand, the two N atoms of bidentate ligand, and the oxo atom. The oxygen donor, occupying an apical position has a trans-labilizing effect, resulting in elongation of the V-N bond. The cyclic voltammograms of the complexes exhibited one cathodic response in the range −d1.45 $\sim$ −f1.52 V due to the reduction of V(IV) to V(III).

• 대한화학회지
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• 제18권3호
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• pp.189-193
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• 1974

세자리 schiff base 리간드로서 salicylidene imino-o-thiobenzene은 salicylaldehyde와 o-aminothiolbenzene을 Duff reaction 시킴으로써 합성하였으며 이 리간드와 Cu(II), Ni(II), 및 Zn(II) 이온들과의 반응으로서 새로운 착물 Cu(II)$[C_{13}H_9ONS]{\cdot}3H_2O$, 및 Ni(II)$[C_{13}H_9ONS]{\cdot}3H_2O,\;Zn(II)[C_{13}H_9ONS]{\cdot}3H_2O$들을 합성하였다. 이 착물들은 가시부 자외선스펙트럼, 적외선스펙트럼, TGA, DTA 및 원소분석측정에 의하여 리간드와 금속은 1:1 몰비로 착물을 이루며 Cu(II) 착물은 1수화물 4배위 결합착물이고 Ni(II), 및 Zn(II) 착물은 3수화물, 6배위 결합의 착물임을 알아보았다.