Preparation of Stable Closo- and Nido-Cobaltaboranes from Na(+)B5H8(-).  Complexes of the Formal B4H8(2-) and B4H8(2) and B4H6(4-) Ligands.

Miller, Vernon R.; Grimes, Russell N.

Preparation of Stable Closo- and Nido-Cobaltaboranes from Na(+)B5H8(-). Complexes of the Formal B4H8(2-) and B4H8(2) and B4H6(4-) Ligands.

Active / Technical Report | Accession Number: AD0761642 |

Abstract:

The novel air-stable, crystalline metalloboranes nido-B4H8Copi-C5H5 Ia, closo-R-1,2-B4H5Co2pi-C5H52 II, RH III, R 3-cyclo-C5H9 IV, R 4-cyclo-C5H9, and nido-5-B9H13Copi-C5H5 V have been prepared by the reaction of NaB5H8- with CoCl2 and NaC5H5 in tetrahydrofuran solution followed by treatement with aqueous HCl and air oxidation. Pyrolysis of Ia with acetylene in the gas phase at 200 gives an isomer, Ib. From 11B and H nmr, infrared, and mass spectra it is proposed that the cage framework in Ia and Ib is a square pyramid analogous to B5H9 with cobalt occupying a basal position in Ia and an apex position in Ib, II-IV are closed octahedra analogous to C2B4H8, and V has a B10H14-like open-cage structure. All of the structures except Ib are proposed to contain B-H-Co bridging groups. Author

Author(s):

Miller, Vernon R. ; Grimes, Russell N.

Author Organization(s):

VIRGINIA UNIV CHARLOTTESVILLE DEPT OF CHEMISTRY

Descriptive Note:

Technical rept.,

Pagination:

0015

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:

Approved For Public Release

RECORD

Collection: TR

Identifying Numbers

Report Number(s):

TR-13

Contract/Grant Number(s):

N00014-69-A-0060-0003

Subject Terms

Communities of Interest:

No COI(s) Identified

Descriptor(s):

*BORON COMPOUNDS, *COBALT COMPOUNDS, SYNTHESIS(CHEMISTRY), SYNTHESIS(CHEMISTRY), BORATES, CHELATE COMPOUNDS, ORGANOMETALLIC COMPOUNDS, MOLECULAR STRUCTURE, NUCLEAR MAGNETIC RESONANCE

Field(s)/Group(s):

Inorganic Chemistry, Organic Chemistry

Report Date:

1973 Jun 01