Abstract/Details

Investigation of the structure and bonding of metal complexes through the use of density functional theory


2005 2005

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Abstract (summary)

Density functional theory has been used to investigate the structure, bonding and spectroscopic properties of a variety of interesting and potentially useful inorganic complexes. The photoluminescent (CuN(SiX3) 2)4 complex has an unusual square geometry with no formal Cu-Cu bonding. TDDFT calculations were performed to investigate the origin of the photoluminescence. It was determined that the complex undergoes a significant change in geometry in the cluster-centered, weakly Cu-Cu bonding, excited state. Another unusual copper cluster, Cu3(OL2C X)6, was also examined. This complex is triangular, paramagnetic, and has no formal Cu-Cu bonding. The complex is spin-frustrated, resulting from the arrangement and interaction of the three unpaired electrons on the Cu centers. The EPR parameters were calculated and the possibility of Jahn-Teller stabilization of the doublet state was investigated.

The majority of this work focuses on the structure, energetics and bonding of series of isomeric transition metal complexes. There are a surprising number of “missing” (as of yet unobserved) simple, linear, sandwich complexes that could be formulated with transition metals and CnHn rings from n = 3 to n = 8. The Group 6 MC12H12 isomers [(η6-C6H6)2M, (η 5-C5H5)M(η7-C7H 7), (η4-C4H4)M(η 8-C8H8)], Group 8 MC10H10 isomers [(η5-C5H5)2M, (η5-C4H4)M(η6-C 6H6), (η3-C3H3)M(η 7-C7H7)] and NiC8H8 isomers [(η4-C4H4)2Ni, (η 3-C3H3)Ni(η5-C5H 5)] were studied, The NiC8H8 study was extended to include (η2-C2H2)Ni(η 6-C6H6) and (η8-C8H 8)Ni. The ground-state geometry was determined for all isomers, and bonding analysis was performed to determine the dominantly bound fragment in all the species, It was found that, in general, the distance between the metal and ring centroids was long for π-bound rings and significantly shorter in δ-bound rings. The out-of-plane bending of the C-H bonds in the ring ligands varied according to how mismatched the ring π orbitals were in relation to the M δ orbitals. The bonding analysis found that the dominantly bound rings were not necessarily those with π bonds, the most covalent character, or best size match, Each complex was analyzed individually to determine the dominantly bound ring, and to understand the interactions. Attention was paid to the changes seen as the metal was changed both moving across and down the transition metal block.

Indexing (details)


Subject
Chemistry
Classification
0488: Chemistry
Identifier / keyword
Pure sciences; Copper-copper bonds; Nickel; Organometallics
Title
Investigation of the structure and bonding of metal complexes through the use of density functional theory
Author
Brett, Constance M.
Number of pages
333
Publication year
2005
Degree date
2005
School code
0168
Source
DAI-B 66/06, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
0542196328, 9780542196324
Advisor
Bursten, Bruce E.
University/institution
The Ohio State University
University location
United States -- Ohio
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3177149
ProQuest document ID
305424983
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305424983
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