Magnetic isomers of iron(II). Bis(C-cyanotrihydroborate)bis(phenanthroline)iron: a spin triplet
Journal Article
·
· Inorg. Chem.; (United States)
The synthesis of an unusual six-coordinated, spin triplet (S = 1) ferrous complex, Fe(phen)/sub 2/(NCBH/sub 3/)/sub 2/, with cis geometry is described. This complex is characterized by its magnetic moment and infrared, visible-region, and Moessbauer spectra. On the basis of these data and the angular overlap model of metal--ligand bonding, -NCBH/sub 3/ is characterized as a ligand possessing moderate sigma- and pi-donor characteristics toward Fe(phen)/sub 2//sup 2 +/. How a proper balance of sigma- and pi-donor properties of -NCBH/sub 3/ and phen yields the spin-triplet state of the ferrous complex is discussed. Consideration of the CN stretching frequency data for the isomeric pairs of Fe(phen)/sub 2/(NCBH/sub 3/)/sub 2/ and Fe(phen)/sub 2/(CNBH/sub 3/)/sub 2/ and other bridged cyano species raises interesting questions about the effect of double coordination of cyanide on the CN sigma bonding. Finally, thermal stability studies of the Fe--CN--BH/sub 3/ and Fe--NC--BH/sub 3/ linkages eliminate the possibility of isomerization by a facile CN flip mechanism within the Fe and B cage and suggest that (phen)/sub 2/Fe(NCBH/sub 3/)/sub 2/ is the thermodynamically favored isomer.
- Research Organization:
- Kansas State Univ., Manhattan
- OSTI ID:
- 7091738
- Journal Information:
- Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 16:7; ISSN INOCA
- Country of Publication:
- United States
- Language:
- English
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Wed Sep 07 00:00:00 EDT 1988
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OSTI ID:6729787
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
BORON COMPOUNDS
CHEMICAL PREPARATION
COMPLEXES
HETEROCYCLIC COMPOUNDS
IRON COMPLEXES
ISOMERS
MAGNETIC MOMENTS
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHENANTHROLINES
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
400201* -- Chemical & Physicochemical Properties
BORON COMPOUNDS
CHEMICAL PREPARATION
COMPLEXES
HETEROCYCLIC COMPOUNDS
IRON COMPLEXES
ISOMERS
MAGNETIC MOMENTS
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHENANTHROLINES
SYNTHESIS
TRANSITION ELEMENT COMPLEXES