• 제목/요약/키워드: Ni(II)-Macrocyclic Complex

검색결과 23건 처리시간 0.026초

Synthesis and Characterization of Schiff Base Metal Complexes and Reactivity Studies with Malemide Epoxy Resin

  • Lakshmi, B.;Shivananda, K.N.;Prakash, Gouda Avaji;Isloor, Arun M.;Mahendra, K.N.
    • Bulletin of the Korean Chemical Society
    • /
    • 제33권2호
    • /
    • pp.473-482
    • /
    • 2012
  • A novel malemide epoxy containing Co(II), Ni(II) and Cu(II) ions have been synthesized by curing malemide epoxy resin (MIEB-13) and Co(II), Ni(II) and Cu(II) complexes of macrocyclic bis-hydrazone Schiff base. The Schiff base was synthesized by reacting 1,4-dicarbnyl phenyl dihydrazide with 2,6-diformyl-4-methyl phenol. The Schiff base and its Co(II), Ni(II) and Cu(II) complexes have been characterized by elemental analyses, spectral (IR, $^1H$ NMR, UV-vis., FAB mass, ESR), thermal and magnetic data. The curing reaction of maleimide epoxy compound with metal complexes was studied as curing agents. The stability of cured samples was studied by thermo-gravimetric analyses and which have excellent chemical (acid/alkali/solvent) and water absorption resistance. Further, the scanning electron microscopy (SEM) and definitional scanning colorimetric (DSC) techniques were confirmed the phase homogeneity of the cured systems.

Halide (Cl-, Br-, I-) Influence on the Electronic Properties of Macrocyclic Nickel(II) Complexes: Ab-initio DFT Study

  • Zarei, Seyed Amir;Akhtari, Keivan;Hassanzadeh, Keyumars;Piltan, Mohammad;Saaidpour, Saadi;Abedi, Marjan
    • 대한화학회지
    • /
    • 제57권3호
    • /
    • pp.311-315
    • /
    • 2013
  • The geometry structures of hexa-coordinated [NiLX]X complexes ($X=Cl^-,\;Br^-,\;I^-$) {L = 8,9,18,19-tetrahydro-7H,17H-dibenzo[f,o] [1,5,9,13]dioxadiaza cyclohexadecine-8,18-diol} are optimized by density functional theory (DFT) using B3LYP/LANL2DZ. The calculated geometric parameters are in good agreement with the corresponding experimental values. Calculation results about these complexes show that dipole moment decreases, and the energy levels of HOMOs descend from iodo-complex to chloro-complex. The energy levels of HOMOs descend gently from iodo-complex to chloro-complex, while the energy levels of LUMOs in the present complexes are almost similar; therefore the energy gapes between HOMOs and LUMOs increased from iodo-complex to chloro-complex.

One-Dimensional Hydrogen-Bonded Infinite Chains Composed of a Nickel(II) Macrocyclic Complex and Organic Ligands

  • Choi, Ki-Young;Ryu, Hae-Il;Lee, Kyu-Chul;Lee, Han-Hyoung;Hong, Choon-Pyo;Kim, Jae-Hyun;Sung, Nack-Do
    • Bulletin of the Korean Chemical Society
    • /
    • 제24권8호
    • /
    • pp.1150-1154
    • /
    • 2003
  • The reactions of [Ni(L)(H₂O)₂]Cl₂ (L = 2,5,9,12-tetramethyl-1,4,8,11-tetraazacyclotetradecane) with terephtalate (tp) and 2,5-pyridinedicarboxylate (pdc) generate one-dimensional nickel(II) complexes, [Ni(L)(H₂O)₂](tp) · ₄H₂O (1) and [Ni(L)(H₂O)₂](pdc)·₄H₂O (2). The structures have been characterized by X-ray crystallography, magnetic susceptibility and spectroscopy. The crystal structures of 1 and 2 show a distorted octahedral coordination geometry around the Ni(II) ion, with secondary amines of the macrocycle and two water molecules at the trans position. Complexes 1 and 2 display the one-dimensional hydrogen-bonded infinite chains. The magnetic behavior of all compounds exhibits weak interchain antiferromagnetic interactions with J values of -1.09(3) for 1 and -1.14(2) cm-1 for 2.

Electrochemical Study of Nickel(II) Complexes with Diaza-Macrocyclic Ligands in Acetonitrile

  • Moo-Lyong Seo;Zun-Ung Bae;Tae-Myoung Park
    • Bulletin of the Korean Chemical Society
    • /
    • 제12권4호
    • /
    • pp.368-370
    • /
    • 1991
  • The electrochemical behavior and the complex formation between N$i^{2+}$ and 1,7-diazs-15-crown-5 and 1,10-diaza-18-crown-6 in acetonitrile solution have been studied by DC polarography, differential puke polarography and cyclic voltammetry. Nickel(Ⅱ) complexes gave a single well-defined wave. The formation constants of their complexes were 1$0^{4.89} and 10^{3.86}$, respectively. Nickel(Ⅱ) ion was found to form complexes of 1-to-1 composition with 1,7-diaza-15-crown-5 and 1,10-diaza-18-crown-6. In addition, reduction steps were irreversible and the reduction current were diffusion controlled. The electrochemical reduction mechanism of Ni(Ⅱ)-macrocyclic diaza-crown complexes in acetonitrile solution is estimated.

Preparation and Properties of New Di-N-alkylated 14-Membered Tetraaza Macrocycles and Their Nickel(II) and Copper(II) Complexes

  • 강신걸;송정훈;황동막;김기문
    • Bulletin of the Korean Chemical Society
    • /
    • 제21권11호
    • /
    • pp.1106-1110
    • /
    • 2000
  • New 14-membered tetraaza macrocycles 1,8-diallyl-3,5,7,7,10,12,14,14-octamethyl-1,4,8,11-tetraazacyclotetradecane $(L^2)$ and 1,8-bis(n-propyl)-3,5,7,7,10,12,14,14-octamethyl-1,4,8,11-tetraazacyclotetradecane $(L^3)$ have been prepared by direct react ion of 2,5,5,7,9,12,12,14-octamethyl-1,4,8,11-tetraazacyclotetradecane $(L^1)with$ allyl bromide or n-propyl bromide. The nickel(II) and copper(II) complexes of $L^2andL^3have$ been prepared. The macrocycles show high copper(II) selectivity against nickel(II) ion in methanol solutions containing water. The wavelengths (ca. 505 nm) of the d-d bands for the nickel(II) complexes are extraordinarily longer than those for the complexes of $L^1and$ other related di-N-alkylated 14-membered tetraaza macrocycles. Crystal structure of $[NiL^2](ClO4)_2$ shows that the average Ni-N bond distance $(1.992\AA)$ of the complex is distinctly longer than those of other related nickel(II) complexes. Effects of the N- and C-substituents on the properties of the macrocyclic compounds are discussed.

Macrocyclic Tetraamine Bis(isocyanato-N)nickel (II) Complex

  • Park, Ki-Young;Kim, Moon-Jib;Lee, Chang-Hee;Seong, Baek-Seok;Lee, Jin-Ho;Suh, Il-Hwan
    • 한국결정학회지
    • /
    • 제9권2호
    • /
    • pp.92-95
    • /
    • 1998
  • The structure of bis(isocyanto-N)nickel (II) complex, [Ni(L)(NCO)2] (L: 2,5,9,12-tetramethyl-1,4,8,11-tetraazacyclotetradecane), is centrosymmetric and the central nickel has an axially elongated octahedral geometry with two nitrogen atoms of the isocyanate ligand.

  • PDF

수소 결합에 의한 이차원의 Nickel(II) Tetraaza 거대 고리 착물 결합구조 (Crystal Structure of Three-Dimensional Nickel(II) Tetraaza Macrocyclic Complex Linked by Hydrogen-Bonds)

  • Park, Ki-Young;Choo, Geum-Hong;Suh, Il-Hwan
    • 한국결정학회지
    • /
    • 제13권1호
    • /
    • pp.12-16
    • /
    • 2002
  • [Ni(L)](BDC)·4H₂O (1) (L = 3,14-dimethyl-2,6,13,17-tetraazatricyclo[16,4,O/sup 1.18/,O/sup 7.12/]docosane;BDC = 1,3-benzenedicarboxylate) 착물을 합성하고 구조를 규명하였다. 이 착물은 사방정계, 공간군 Pcnb, a = 8.764(2) , b = 17.687(2) , c = 19.475(1) , V = 3018.7(8) ³, Z = 4로 결정화 되었다. 이 착물의 구조는 최소자승법으로 정밀화하였으며, 최종 신뢰도 R₁(wR₂)값은 2148개의 회절반점에 대하여 0.0822 및 0.2236이었다. 화합물 1은 수소결합들로 연결된 삼차원의 그물 구조를 갖는다.

극성용매에서 거대고리 Ni (II) 착물의 광흡수와 폴라로그램 (Optical Absorption and Polarogram of Macrocyclic Nickel (II) Complexes in Polar Solvents)

  • 박유철;변종철
    • 대한화학회지
    • /
    • 제31권2호
    • /
    • pp.168-177
    • /
    • 1987
  • 극성용매(L; ANT, MFA, DMSO, DMF, DMA)에서 $\alpha$-Ni(rac-[14]-decane)$^{2+}$의 화학평형 관계를 상온에서 분광광도법으로 연구하였다. ANT, MFA, DMSO, DMF, DMA일 때 평행상수 $K_1$은 각각 31.0, 27.5, 21.3 15.9, 6.4이었으며 $K_2$$K_1$보다 적은 값이었다. $\alpha$-Ni(rac-[14]-dacane)$^{2+}$ + L $\leftrightharpoons$ [$\alpha$-Ni(rac-[14]-decane){\cdot}L]$^{2+}$ : $K_1$[$\alpha$-Ni(rac-[14]-decane){\cdot}L)$^{2+}$ + L $\leftrightharpoons$ [$\alpha$-Ni(rac-[14]-decane){\cdot}$L_2$)$^{2+}$; $K_2$.ACT에서 Ni(II)-macrocycle 착이온의 d-d흡수에너지 ($cm^{-1}$와 환원 반파전위 ($E_{1/2}$, V vs. SCE)사이의 상관성을 조사하였다. d-d 전이에너지를 크게하는 거대고리 리간드일수록 착이온의 반파전위는 좀더 양의 값으로 이동하였다. Ni(rac-1[14]7-diene)$^{2+}$, Ni(meso-1[14]7-diene)$^{2+}$, Ni(1[14]4-diene)$^{2+}$, $\alpha$-Ni(rac-[14]-decane)$^{2+}$, $\beta$-Ni(rac-[14]-decane)$^{2+}$, Ni(meso-[14]-decane)$^{2+}$ 착이온의 환원반파전위는 각각 -1.419, -1.431, -1.450, -1.473, -1.480 (V vs. SCE)이었다. 몇 가지 용매에서 Ni(meso-[14]-decane)$^+$ 이성질체의 d-d전이에너지($\nu_{max},\;cm^{-1}$) 변화와 용매의 유전상수(${\varepsilon}/{\varepsilon}_0$) 관계를 고찰하였으며 ${\varepsilon}/{\varepsilon}_0$가 클수록 $\nu_{max}(cm^{-1})$는 증가하였다.

  • PDF

질소-산소 주개 거대고리 화합물-금속착물의 수용액에서의 안정도상수 (Stability Constants of Nitrogen-Oxygen Donor Macrocyclic Ligand-Metal Ion Complexes in Aqueous Solutions)

  • 김정;윤창주;박휴범;김시중
    • 대한화학회지
    • /
    • 제35권2호
    • /
    • pp.119-127
    • /
    • 1991
  • 고리를 구성하는 원자의 수가 15개에서 18개인 디아자 크라운계의 고대고리 화합물인 1,12-diaza-3, 4 : 9, 10-dibenzo-5, 8-dioxacyclopentadecane(NtnOenH$_4$), 1,13-diaza-3,4 : 10,11-dibenzo-hydroxy-5,9-dioxacyclohexadecane(NtnOtnH$_4$), 1,13-diaza-3,4 : 10,11-dibenzo-15-hydroxy-5,9-dioxacyclohexadecane(Ntn(OH)OtnH$_4$), 1,15-diaza-3,4 : 12,13-dibenzo-5,8,11-trioxacycloheptadecane (NenOdienH$_4$) and 1,15-diaza-3,4 : 12,13-dibenzo-5,8,11-trioxacyclooctadecane(NtnOdienH$_4$)의 양성자화와 금속이온과의 착물 형성을 전위차적정법과 핵자기 공명법으로 연구하였다. 양성자화상수는 크라운 에테르의 염기도를 예측하는데 상용하였다. 본 연구에서 사용한 거대고리 화합물의 염기도 순서는 NenOdienH$_4$ < Ntn(OH)OtnH$_4$ < NtnOenH$_4$ < NtnOtnH$_4$ < NtnOdienH$_4$였다. 염기도의 이와 같은 변화를 거대고리에 대한 치환기와 양성자화가 일어날 때의 고리의 비틀림 정도로 설명하였다. 금속이온과의 착물 형성에 대한 안전도상수는 전이금속이온에 대해서는 Co(II) < Ni(II) < Cu(II) < Zn(II)순이었으며, 중금속이온에 대해서는 Cd(II) < pb(II) < Hg(II)의 순이었다. 금속 착물 형성에 대한 이와 같은 안정도상수의 변화에는 Co(II), Ni(II) 및 Cu(II) 착물의 경우 리간드 고리의 크기가 영향을 미치고 있었으며, Zn(II), Cd(II), pb(II) 및 Hg(II) 착물의 경우에는 리간드의 염기도가 주로 영향을 미치고 있었다. 후전이금속 착물에 대한 $^1$H와 $^{13}$C 핵자기공명 분광법에서는 고리의 질소원자가 산소원자보다 금속이온에 더 큰 친화력을 가짐을 알 수 있었고, 금속이온과 착물을 형성할 때에 고리의 평면성이 상실되고 있음도 밝혀졌다.

  • PDF

거대고리 리간드와 금속이온과의 착물에 관한 반응속도론적 연구 (Kinetic Study of Macrocyclic Ligand-Metal Ion Complexes)

  • 조문환;김진호;박휴범;김시중
    • 대한화학회지
    • /
    • 제33권4호
    • /
    • pp.366-370
    • /
    • 1989
  • 새로운 거대고리 리간드 1,15,18-triaza-3,4 : 12,13-dibenzo-5,8,11-trioxa-cycloeicosane(NdienOdien$H_4$=$N_3O_3$)를 합성하여 $25^{\circ}C$ 95% 메탄올 용액에서 전위차계를 이용하여 양성자 첨가반응의 평형상수를 구한 결과 log $K_1$ ; log $K_2$ ; log $K_3$는 9.1; 8.1; 3.6이었다. 또한 위의 리간드와 이미 합성된 리간드 1,12,15-triaza-3,4;9,10-dibenzo-5,8-dioxa-cycloheptadecane(NdienOen$H_4$=$N_3O_2$)를 각각 Ni(II), Cu(II)의 금속이온과의 착물을 합성하여 수용액에서 산을 가해 착물의 산해리반응 속도 상수를 여러온도에서 분광광도법으로 측정하였다. 또한 활성화에너지($E_a$)와 활성화파라메타 ${\Delta}H^{\neq}$, ${\Delta}S^{\neq}$를 구하였다. 그리고 이들의 자료로부터 이 반응계의 타당한 해리메카니즘을 제안하였다.

  • PDF