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Structural correlations and conformational preference in edge-sharing binuclear d8 complexes with XR2 bridges. A
G Aullón1, A Lledós, S Alvarez
1Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain.
Inorganic Chemistry
|January 16, 2003
Summary
Binuclear d8 transition metal complexes exhibit diverse molecular shapes, including planar and bent conformations. These structures are dictated by a balance of bonding and steric interactions, influencing their overall geometry.
Area of Science:
- Inorganic Chemistry
- Computational Chemistry
- Materials Science
Background:
- Binuclear d8 transition metal complexes, [M2(mu-XR2)2L4], display varied molecular geometries.
- These geometries include coplanar and bent conformations around the metal centers.
- Asymmetric bridging ligands (XR1R2) lead to specific substituent orientations in bent structures.
Purpose of the Study:
- To establish structural correlations within a family of binuclear d8 transition metal complexes.
- To analyze the factors governing the conformational preferences of these complexes.
- To understand the interplay of electronic and steric effects on molecular structure.
Main Methods:
- Utilized ab initio theoretical studies on 30 representative complexes.
- Performed a complementary structural database analysis.
- Qualitatively analyzed various interactions influencing conformation.
Main Results:
- Identified diverse molecular conformations (coplanar and bent) in [M2(mu-XR2)2L4] complexes.
- Correlated structural features with bridging ligand asymmetry and terminal ligand steric effects.
- Observed weak metal-metal bonding in bent conformations.
Conclusions:
- Conformational choice is determined by a balance of interactions.
- Bond angles, metal-metal bonding, and steric factors are key determinants.
- Structural correlations provide insights into the design of these complexes.