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1996 Fiscal Year Final Research Report Summary

STRUCTURAL STUDY OF HYPERVALENT COMPOUNDS BY ^<121>Sb AND ^<127>I MossBAUER SPECTROSCOPY

Research Project

Project/Area Number 06453053
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic chemistry
Research InstitutionTOHO UNIVERSITY

Principal Investigator

TAKEDA Masuo  TOHO UNIV., FAC.OF.SCI., PROFESSOR, 理学部, 教授 (80011633)

Co-Investigator(Kenkyū-buntansha) KITAZAWA Takafumi  TOHO UNIV., FAC.OF.SCI., LECTURER, 理学部, 講師 (60246767)
TAKAHASHI Masashi  TOHO UNIV., FAC.OF.SCI., ASSISTANT PROF., 理学部, 助教授 (30171523)
Project Period (FY) 1994 – 1996
KeywordsMossbauer spectroscopy / Hypervalent compounds / Structural Chemistry / Antimony / Iodine / Apical bonding / 3-center 4-electron bond
Research Abstract

Nature of the hypervalent bonds of X-Sb-X,O-Sb-X,O-Sb-O,N-Sb-X,C-Sb-X (X=halogens) and Cl-I-Cl, Cl-I-O,O-I-O in trigonal bipyramidal 10-Sb (V) -5, pseudo-trigonal bipyramidal 10-Sb (III) -4 with a lone pair, octahedral 12-Sb (V) -6 and pseudo-trigonal bipyramidal 10-I (III) -3 with two lone pairs was studied by ^<121>Sb and ^<127>I Mossbauer spectroscopy, and single crystal X-ray structural analysis.
^<121>Sb and ^<127>I Mossbauer spectroscopy gave separately the information on the distribution of s- and p- electron density around Mossbauer atoms, thus the essential feature of the hypervalent bonds (3-center 4-electron bonds) as following was elucidated.
(1) Both 5s and 5p_Z orbitals of antimony atoms being involved in the Sb-X bonding, it has both s and p character. On the other hand Sb-O bonding has mainly p character.
(2) 5s orbitals of iodine do not contribute to l-O and l-Cl bond formation, only 5p_Z orbitals do.
(3) The nature of the O-Sb-l bonding is very similar between trigonal bipyramidal 10-Sb (V) -5 and octahedral 12-Sb (V) -6.
(4) The amount of negative charge on iodine depends on the strength of the Sb-l bondand the electronegativity of atom E in E-Sb-I (E=O,I,N,C) 3-c 4-e bond.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] M.Takeda: "^<121>Sb Mossbauer Spectra of Six-Coordinate Antinicny(V) Comploes of Hexafluorocamyl Alcohol" Conf. Proc. -Ital,Phys,Soc.,50(International Conference on the Applications of the Morsbauer Effectr 1995,Pt2). 50. 107-110 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Takahashi: "^<127>I Mossbauer Spectra and Xray Crystal Stncitures for Hypervalent Iodine (III) Conplex of Hex Luclomouyl Alcolnol and Related 10-I-3 Conpounds" J.Coord,Chem.37. 371-378 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Takeda: "^<121>Sb Mossbauer spectra of Six-Coordinate Antimong (v) Complexes of Hexafluorocumyl Alcohol" Conf, Proc.-Ital.Phys.Stc., so (International Conference on the Applications of the Mossbauer Effect, 1995, Pt.2). 50. 107-110 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Takahashi: "^<127>I Mossbauer spectra and X ray Crystal structures for Hypervalent Iodine (III) Complex of Hexafluorocumyl Alcohol and Related 10-I-3 Compounds" J.Coord.Chem.37. 371-378 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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