• 대한화학회지
• /
• 제29권3호
• /
• pp.257-264
• /
• 1985

메탄올 용액에서 3-메톡시살리실알데히드와 몰리브덴산암모늄으로 부터 디옥소비스메톡시살리실알데히다토 몰리브데늄(VI) 착물을 합성하고 이를 일차아민과 반응시켜 MoO$_2$(CH$_3$O-sal-N-R)$_2$, (R;일차아민)형의 시프-염기착물을 합성하였다. 이들에 대한 원소분석, 스펙트라의 해석 그리고 전기전도도의 측정으로 부터 착물의 성질과 그 구조를 추정하였다. 적외선 스펙트라에서 Mo=O 신축진동에 기인한 두 개의 흡수띠가 900cm$^{-1}$부근에서 관찰되었으며 이는 Mo(VI) 착물이 cis-MoO$_2$형으로 되어있음을 나타낸다. 또한 MoO$_2$와 배위자 사이의 결합비가 1:2임을 알 수 있었다. 이들 착물의 전자스펙트라에서 배위자로부터 금속으로 전하이동전이가 일어났다. 이들 착물은 노란색 혹은 오렌지색깔을 띠며 비극성물질로서 알코올이나 디클로로메탄, 클로로포름 및 디메틸프름 아마이드에 약간 녹인다.

• 대한화학회지
• /
• 제55권3호
• /
• pp.418-429
• /
• 2011

[ $N^1,N^2$ ]bis(3-((3-hydroxynaphthalen-2-yl)methylene-amino)propyl)phthalamide ($H_4L$, 1) 의 새로운 크롬(III), 망간(II), 철(III), 코발트(II), 니켈(II), 구리(II), 루테늄(III) 및 산화 지르코늄(II) 착물을 합성하여 원소분석, 물리적 성질 및 분광학적으로 특성을 규명하였다. 분광학적 결과를 통해 이 리간드는 $[H_4LMX_2(H_2O)]{\cdot}nH_2O$ (M = Cu(II), Ni(II), Co(II), X = Cl 또는 $NO_3$)의 일반식을 갖는 착물2-5에서는 중성의 삼배위 리간드로 행동한다. 또는 $[H_4L(ZrO)_2Cl_2]{\cdot}8H_2O$ 의 일반식을 갖는 착물 6-9 에서는 이염기성 육배위 리간드로 행동한다. DMF 용액에서의 몰전기전도도 실험결과 이들 착물은 비이온성을 나타낸다. 고체 구리착물 2, 5 및 6 의 ESR 스펙트럼에서 $g_{\parallel}$ >g> $g_e$을 보이는데, 이는 일그러진 팔면체구조와 큰 공유결합성을 갖는 $d{_x}^2{_{-y}}^2$ 오비탈에 비공유 전자쌍이 존재함을 의미한다. 이합체 구리(II) 착물 $[H_2LCu_2Cl_2(H_2O)_4]{\cdot}3H_2O$ (6)에 대해 두 구리원자 사이의 거리를 ESR 스펙트럼으로부터 추정한 parallel component 의 field zero splitting 파라메타를 이용하여 계산하였다. 이들 화합물의 항박테리아 및 항균 활성도를 측정한 결과, 몇가지 금속 착물의 경우 표준시약인 tetracycline (박테리아) 및 Amphotricene B (균류)보다 더 큰 저해효과를 보였다.

• Bulletin of the Korean Chemical Society
• /
• 제34권9호
• /
• pp.2597-2603
• /
• 2013

The reactions of hydrated $CdCl_2$, $MnCl_2$, and $NiCl_2$ with 2,2'-bipyidine-3,3',6,6'-tetracarboxylic acid ($H_4bptc$) afforded the mononuclear [$Cd^{II}(H_2bptc)(H_2O)_3]{\cdot}H_2O$ (1), linear $\{[Cd(H_2bptc)(H_2O)]{\cdot}3H_2O\}_n$ (2), 3-D heterobimetallic $[NaCd(Hbptc)(H_2O)]$ (3), layer $[Mn(H_2bptc)(H_2O)]_n$ (4) and a dinuclear compound $[Ni_2(H_2bptc)-(H_2O)_2]{\cdot}6H_2O$ (5). These compounds have been characterized by elemental analysis, IR, and their structures have been determined by X-ray crystallography. The thermal stabilities of 1-3 were measured by thermogravimetric analysis (TGA) and their solid state luminescence properties together with the free ligand $H_4bptc$ were investigated at room temperature.

• 한국환경과학회지
• /
• 제18권7호
• /
• pp.735-746
• /
• 2009

Hydrochloric acid salt of a new $N_2O_3$ pentadentate ligand, N,N'-Bis(2-Hydroxybenzyl)-1,3-diamino-2-propanol(H-BHDP 2HCl) was synthesized. Br-BHDP 2HCl, CI-BHDP 2HCl, $CH_3-BHDP$ 2HCl and $CH_3O$-BHDP 2HCl having Br, Cl, $CH_3$ and $CH_3O$ substituents at 5-position of the phenol group of H-BHDP 2HCl were also synthesized. The potentiometry study in aqueous solution revealed that the proton dissociations of the synthesized ligands occurred in four steps and their order of the calculated overall proton dissociation constants($log{\beta}_p$) was Br-BHDP < Cl-BHDP < H-BHDP < $CH_3O-BHDP$ < $CH_3-BHDP$. The order showed a similar trend to that of Hammett substituent constants(${\delta}_p$). The order of the stability constants($logK_{ML}$) was Co(II) < Ni(II) < Cu(II) < Zn(II) < Cd(II) < Pb(II). The order in their stability constants ($logK_{ML}$) of each transition metal complex agreed with that of the overall proton dissociation constants ($log{\beta}_p$).

• Bulletin of the Korean Chemical Society
• /
• 제28권8호
• /
• pp.1311-1316
• /
• 2007

To develop photo-sensitizers for dye-sensitized solar cells (DSCs) used in harvesting sunlight and transferring solar energy into electricity, we synthesize novel Ru(II) polypyridyl dyes and describe their characterization. We also investigate the photo-electrochemical properties of DSCs using these sensitizers. New dyes contain chromophore unit of dafo (4,5-diazafluoren-9-one) or phen-dione (1,10-phenanthroline-5,6-dione) instead of the nonchromophoric donor unit of thiocyanato ligand in cis-[RuII(dcbpy)2(NCS)2] (dcbpy = 4,4'-dicarboxy- 2,2'-bipyridine) coded as N3 dye. For example, the photovoltaic data of DSCs using [RuII(dcbpy)2(dafo)](CN)2 as a sensitizer show 6.85 mA/cm2, 0.70 V, 0.58 and 2.82% in short-circuit current (Jsc ), open-circuit voltage (Voc), fill factor (FF) and power conversion efficiency (Eff), which can be compared with those of 7.90 mA/ cm2, 0.70 V, 0.53 and 3.03% for N3 dye. With the same chelating ligand directly bonded to the Ru metal in the complex, the CN ligand increases the Jsc value by double, compared to the SCN ligand. The extra binding ability in these new dyes makes them more resistant against ligand loss and photo-induced isomerization within octahedral geometry.

• 한국결정학회지
• /
• 제18권1_2호
• /
• pp.21-25
• /
• 2007

Dipyridyl 리간드 L'(N,N'-bis-(1-pyridin-4-yl-ethylidene)-naphthalene-1,5-diamine)을 함유한 $CH_2Cl_2$ 용액을 $Co(NO_3)_2{\cdot}6H_2O$을 함유한 MeOH 용액 위에 깔았을 때, 배위 고분자가 아닌, 분자성 코발트 화합물 [$CoL_2(MeOH)(NO_3)_2$] (1)이 형성되었다. 화합물 1의 X-ray 구조 분석 결과, 이 화합물은 pyridyl-amine 리간드 L(N1-(4-Imino-1-methyl-but-2-enylidene)-naphthalene-1,5-diamine)을 함유하고 있었다. 반응 중에 리간드 L'이 리간드 L로 가수분해되었다는 것을 화합물 1의 구조가 강하게 암시하고 있다.

• 대한화학회지
• /
• 제35권6호
• /
• pp.667-672
• /
• 1991

팔라듐(Ⅱ) 이온의 존재하에서 isonitrosobenzoylacetone(IBA)과 diamine (ethylenediamine(en) 또는 trimethylenediamine(tn))으로부터 새로운 착물들인 N-(2-aminoethylisonitrosobenzoylacetone imino) chloropalladium(Ⅱ), PdCl(IBA)-en, 및 N-(3-aminopropylisonitrosobenzoylacetone imino) chloropalladium(Ⅱ), PdCl (IBA)-tn을 합성하고 이들 착물의 구조를 조사하였다. 그 결과 이들 착물은 모두 사각평면구조를 가지며 하나의 디이민리간드와 염소이온이 금속에 배위되어 있음을 알 수 있었다. 여기서 디이민리간드는 isonitrosobenzoylacetone과 diamine이 1:1로 반응하여 생성되었으며, isonitroso (=N-O), C=N 및 $NH_2$기의 세개의 질소원자들을 통하여 금속에 결합하고 있는 세자리 리간드임을 알 수 있었다.

• Bulletin of the Korean Chemical Society
• /
• 제19권11호
• /
• pp.1211-1216
• /
• 1998

Bis(diethyldithiocarbamato)ioxomolybdenum(VI), cis-MoO2(S2CNEt2)2, 1, reacted with chlorotrimethylsilane (Me33SiCl) to give a seven-coordinate, pentagonal bipyramidal complex MoOC12(S2CN]Et2)2, 3, in which the oxo ligand is trans to the chloride ligand and the two chloride ligands are mutually cis. The monooxo molybdenum complex bis(diethyidithiocarbamato)oxomolybdenum(IV), MoO(S2CNEt2)2, 2, reacted with phenyl isocyanate (PhNCO) to give an Mo dimer MO2{μ-N(CONPh)Ph}(μ-NPh)(NPh)2(S2CNEt2)2, 4, which contains an Mo-Mo bond, two diethyldithiocarbamato ligands, two terminal imido (NPh) ligands, and two bridging hnido (NPh) ligands. One of the two bridging NPh ligands seemed to have been attacked by the electrophilic phenyl isocyanate carbon, which suggests that the bridging imido NPh ligand is more nucleophilic than the terminal one. Crystallographic data for 3: monoclinic space group P21/c, a=8.908(l) Å, b=17.509(3) Å, c=12.683(2) Å, β=110.15(1)°, Z=4, R(wR2)=0.0611(0.1385). Crystallographic data for 4-THF: orthorhombic space group P212121, a=17.932(4) Å, b=22.715(5) Å, c=11.802(3) Å, Z=4, R(wR2)=0.0585(0.1286).

• Bulletin of the Korean Chemical Society
• /
• 제9권5호
• /
• pp.292-295
• /
• 1988

Macrocyclic ligands have been studies as cation carriers in a bulk liquid membrane system. $Cu^{2+}$ has been transported using nitrogen substituted macrocycles as carriers and several transition metal ions($M^{n+}\;=\;Mn^{2+},\;Co^{2+},\;Ni^{2+},\;Cd^{2+},\;Pb^{2+}\;and\;Ag^{+}$) have been transported using $DBN_3O_2,\;DBN_2O_2,\;Me_6N_414C4$ and DA18C6 as carriers in a bulk liquid membrane system. Competitive $Cu^{2+}-M2^+$ transport studies have also been carried out for the same system. In single cation transport experiments, the best macrocyclic ligand for transport is a ligand that gives a moderately stable rather than very stable complex in the extraction. However, when both cations are present in the source phase, the cation which forms the most stable complex with carrier is favored in transport over other cations. Generally, the nitrogen substiituted macrocycles transport $Cu^{2+}$ selectively over $Mn^+$. Ligand structure, equilibrium constant (or stability constant) for complex formation, source phase pH and carrier concentration are also important parameters in transport experiments.

• 분석과학
• /
• 제35권4호
• /
• pp.143-152
• /
• 2022

In this review, previous studies on the synthesis and characterization of the metal Complexes with paracetamol by elemental analysis, thermal analysis, (IR, NMR and UV-Vis (spectroscopy and conductivity. In reviewing these studies, the authors found that paracetamol can be coordinated through the pair of electrons on the hydroxyl O-atom, carbonyl O-atom, and N-atom of the amide group. If the paracetamol was a monodentate ligand, it will be coordinated by one of the following atoms O-hydroxyl, O-carbonyl or N-amide. But if the paracetamol was bidentate, it is coordinated by atoms (O-carbonyl and N-amide), (O-hydroxyl and N-amide) or (O-carbonyl and O-hydroxyl). The authors also found that free paracetamol and its complexes have antimicrobial activity.