Cobalt(II) Complex of 1,2-Bis(2,2'-bipyridyl-6-yl)ethane. Crystallization Process and Structural Analysis of Two Shapes of Crystals

1,2-비스(2,2'-디피리딜-6일)에탄의 코발트 착물. 두 가지 형태의 결정화 과정 및 구조 분석적 접근

  • Received : 1999.04.01
  • Published : 1999.10.25


Two shapes of crystals have been isolated by the interdiffusion of $Co(NCS)_2$ dissolved in methanol with 1,2-bis(2,2'-bipyridyl-6-yl)ethane (bbpe) dissolved in chloroform. The two crystals have been elucidated as $trans-Co^{II}(NCS)_2(bbpe)$ and $trans-Co^{II}(NCS)_2(bbpe){\cdot}2CHCl_3$, by X-ray crystallography, elemental analysis, IR, and thermal analysis. The two molecular structures are very similar except for the absence or presence of chloroform solvate molecules. The bbpe ligand coordinates to the cobalt(II) ion in an open-ended tetradentate mode, resulting in discrete mononuclear cobalt(II) complex. The cobalt atom adopts a typical octahedral arrangement with six nitrogen donating atoms with two NCS groups in trans positions. A significant solid-to-solid phase transition occurs presumably due to the change of conformationally flexible bbpe ligand. The formation of both crystals oeeurs in a successive two-step process, the formation of $trans-Co^{II}(NCS)_2(bbpe)$ and its transformation into $trans-Co^{II}(NCS)_2(bbpe){\cdot}2CHCl_3$. The thermal stability and favorable formation of the solvate crystals may be ascribed to the interaction between S atom of NCS group and Cl of chloroform.


cobalt complex;crystallization process;structure analysis


  1. Bull. Korean Chem. Soc. v.18 O.-S. Jung;S. H. Park;K. M. Kim;D. C. Kim;H. K. Chae
  2. Inorg. Chem. v.3 F. Basolo;W. H. Baddley;J. L. Burmeister
  3. J. Organomet. Chem. v.8 M. Wada;R. Okawara
  4. Infrared and Raman Spectra of Inorganic and Coordination Compounds K. Nakamoto
  5. Coord. Chem. Rev. v.84 A. Juris;V. Balzani;F. Bargelletti;S. Campagna;P. Belser;A. Von Zelewsky
  6. Inorg. Chem. v.33 M.-T. Youinou;R. Ziessel;J.-M. Lehn
  7. Inorg. Chem. v.29 T. Garber;S. V. Wallendael;D. P. Rillema;M. Kirk;W. E. Hatfield;J. H. Welch;P. Singh
  8. SHELXS-93: A Program for Structure Determination G. M. Sheldrick
  9. Tetrahedron v.48 E. C. Constable
  10. Inorg. Chem. v.33 M. A. Masood;B. P. Sullivan;D. J. Hagson
  11. J. Chem. Soc. Chem. Commun. V. A. Grillo;Z. Sun;K. folting;D. N. Hendrickson;G. Christou
  12. Chem. Eur. J. v.3 A. Williams
  13. SHELXS-86: A Program for Structure Determination G. M. Sheldrick
  14. X-ray Structure Determination: Practical Guide Chap. 4 G. H. Stout;L. H. Jensen
  15. Angew. Chem. v.35 V. A. Grillo;M. J. Knapp;J. C. Bollinger;D. A. Hendricksonand;G. Christou
  16. Chem. Eur. J. v.3 D. P. Funeriu;J.-M. Lehn;G. Baum;D. Fenske
  17. Pure Appl. Chem. v.52 N. Sutin;C. Creutz
  18. Inorg. Chem. v.33 M. A. Masood;B. P. Sullivan;D. J. Hagson


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