• 제목/요약/키워드: Exo-coordination

검색결과 6건 처리시간 0.016초

Endo- and Exo-Coordinated Mercury(II) Complexes of O3S2 Macrocycles: Effect of Dibenzo-Substituents on Coordination Mode

  • Lee, Ji-Eun;Kim, Hyun-Jee;Lee, So-Young;Lee, Jai-Young;Jin, Yong-Nu;Lee, Shim-Sung
    • Bulletin of the Korean Chemical Society
    • /
    • 제28권11호
    • /
    • pp.2041-2044
    • /
    • 2007
  • The reactions of mercury(II) chloride with O3S2-donor macrocyclic ligands with (L1) and without (L2) dibenzosubunit afforded respective exo- (1) and endo-coordinated (2) complexes depending on the ring rigidity of the ligands. From the X-ray crystal structures and comparative NMR studies for the complexes 1 and 2, it is confirmed that the resulting species with different coordination modes exist not only in solid state but also in solution state.

Anion-Dependent Exocyclic Mercury(II) Coordination Polymers of Bis-dithiamacrocycle

  • Siewe, Arlette Deukam;Kim, Seulgi;Choi, Kyu Seong;Lee, Shim Sung
    • Bulletin of the Korean Chemical Society
    • /
    • 제35권12호
    • /
    • pp.3459-3464
    • /
    • 2014
  • Synthesis and structural characterization of mercury(II) halides and perchlorate complexes (1-4) of bis-$OS_2$-macrocycle (L) are reported. L reacts with mercury(II) chloride and bromide to yield an isostructural 2D coordination polymers with type $[Hg(L)X_2]_n$ (1: X = Cl and 2: X = Br). In 1, each Hg atom which lies outside the cavity is six-coordinate with a distorted octahedral geometry, being bound to four adjacent ligands via monodentate Hg-S bonds and two remaining sites are occupied by two terminal chlorido ligands to form a fishnet-like 2D structure. When reacting with mercury(II) iodide, L afforded a 1D coordination polymer $\{[Hg_2(L)I_4]{\cdot}CHCl_3\}_n$ (3) in which each exocyclic Hg atom is four-coordinate, being bound to two sulfur donors from different ligands doubly bridging the ligand molecules in a head-to-tail mode. The coordination sphere in 3 is completed by two iodo terminal ligands, adopting a distorted tetrahedral geometry. On reacting with mercury(II) perchlorate, L forms solvent-coordinated 1D coordination polymer $\{[Hg_2(L)(DMF)_6](ClO_4)_4{\cdot}2DMF\}_n$ (4) instead of the anion-coordination. In 4, the Hg atom is five-coordinate, being bound to two sulfur donors from two different ligands doubly bridging the ligand molecules in a side-by-side mode to form a ribbon-like 1D structure. The three remaining coordination sites in 4 are completed by three DMF molecules in a monodentate manner. Consequently, the different structures and connectivity patterns for the observed exocyclic coordination polymers depending on the anions used are influenced not only by the coordination ability of the anions but also by anion sizes.

Cyclometalated Platinum(II) Complexes Derived from a Chiral Pyridine Ligand: Synthesis, Structure, and Catalytic Activity

  • Yoon, Myeong-Sik;Ryu, Do-Wook;Kim, Jeong-Ryul;Ramesh, Rengan;Ahn, Kyo-Han
    • Bulletin of the Korean Chemical Society
    • /
    • 제28권11호
    • /
    • pp.2045-2050
    • /
    • 2007
  • The reactions of mercury(II) chloride with O3S2-donor macrocyclic ligands with (L1) and without (L2) dibenzosubunit afforded respective exo- (1) and endo-coordinated (2) complexes depending on the ring rigidity of the ligands. From the X-ray crystal structures and comparative NMR studies for the complexes 1 and 2, it is confirmed that the resulting species with different coordination modes exist not only in solid state but also in solution state.

Syntheses and Crystal Structures of Xylyl-Bridged NO2S2-Donor Macrocycles and Binuclear Mercury(II) Complex

  • Lee, Ji-Eun;Jin, Yong-ri;Seo, Joo-beom;Yoon, Il;Song, Mi-Ryoung;Lee, So-Young;Park, Ki-Min;Lee, Shim-Sung
    • Bulletin of the Korean Chemical Society
    • /
    • 제27권2호
    • /
    • pp.203-207
    • /
    • 2006
  • Isomeric series of dilinked $NO_2S_2$ macrocycles ($L^2$: para-, $L^3$: meta- and $L^4$: ortho-linked) capable of binuclear complexing ability were prepared from its monomeric analog $L^1$ in reasonable yields except ortho-type reaction, which led to mixture due to the formation of monomer-type macrocyclic quaternary ammonium bromide $L^5$. Moreover, L2 (as $2HNO_3$ form) and $L^5$ were confirmed by an X-ray crystallography. Reaction of $HgCl_2$ with $L^2$ yielded a binuclear complex $[Hg_2(L^2)Cl_4]$. In the complex, each mercury(II) has a distorted tetrahedral environment made up of S and N donors from an exodentate $L^2$ and two coordinated Cl atoms.

갯봄맞이(Glaux maritima L.) 실생의 단마디배양을 통한 기내증식 (In vitro Multiplication through Single-Node Culture of Sea-Milkwort (Glaux maritima L.))

  • 배수지;강범창;정미혜;김수종;김창길;한증술
    • 원예과학기술지
    • /
    • 제34권3호
    • /
    • pp.461-471
    • /
    • 2016
  • 본 연구는 원예적 가치가 높은 멸종위기 해안식물인 갯봄맞이(Glaux maritima L.)의 기내번식 체계를 확립하기 위하여 수행되었다. 2009년 개인 원예가로부터 갯봄맞이가 심겨진 화분을 분양 받아 줄기와 꽃의 색을 기준으로 'Red type'(RT)과 'Pistachio type'(PT)으로 구분한 후 본 연구의 식물 재료로 사용하였다. 분양 받은 모식물체는 예전 연구 보고에서와 일치하는 꽃, 삭과 및 종자의 외형을 나타내었다. 기내 파종 후 $4^{\circ}C$의 저온에서 4주 이상 처리하였을 때 종자 발아율이 최대에 달했는데, 이는 종자흡습에 이어서 저온처리가 종자의 발아에 필수적이라는 것을 나타내는 것이다. 기내 실생은 모식물체와 동일하게 'RT'와 'PT' 표현형으로 분리하는 것이 관찰되었다. 새롭게 신장한 액아 유래 신초의 마디 수 합을 기준으로 판단한 증식 효율은 표현형과 배지의 종류에 따라 다소 차이가 있기는 했지만 기내 실생에서 절취한 제4절과 제5절을 배양했을 때 가장 높았다. 더불어, 'RT'와 'PT' 표현형의 마디를 BA $0.5mg{\cdot}L^{-1}$ 단용 배지와 BA $0.5mg{\cdot}L^{-1}$ + IAA $0.5mg{\cdot}L^{-1}$ 혼용 배지에서 각각 배양하는 것이 신초 분화율을 가장 높였다. 마디배양 유래 유식물체는 배양실에서 양호하게 기외 순화되었고, 비록 내륙 환경에서 담수 관수를 하는 재배법을 사용했지만 염습 자생지에서와 동일하게 유사일년생 생활환을 완성하였다. 본 연구는 갯봄맞이의 기내 번식에 관한 한 최초인 것으로 판단되며 본 연구의 결과는 이 희귀 종의 서식지외 보존, 자생지 복원 및 원예용으로의 개발에 유용하게 활용될 수 있을 것으로 사료된다.