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Electronic delocalization, energetics, and optical properties of tripalladium ditropylium halides, [Pd(3)(C(7)H(7))(2)X(3)](1-) (X = Cl(-), Br(-), and I(-)).
MedLine Citation:
PMID:  20302315     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Here we report relativistic electronic structure calculations employing all-electron density functional theory (DFT) including scalar and spin-orbit interaction, on the multimetallic sandwich compound [Pd(3)(C(7)H(7))(2)X(3)](1-) (X = Cl(-) (1), Br(-) (2), and I(-) (3)), which can be considered as a [Pd(3)X(3)](3-) fragment flanked by two ring-ligands [(C(7)H(7))(2)](2+). The calculations suggest that the [Pd(3)X(3)](3-)-ligand interaction is mainly arising from electrostatic contributions, where the formally zerovalent Pd atoms allows backdonation of charge from the halide X(1-) atoms to the [(C(7)H(7))(2)](2+) ligands, resulting in a net charge of about +0.4 for each Pd atoms that decreases from 1 to 3. The electronic delocalization estimated via the NICS indexes and the ELF function allows us to describe a significant stabilizing sigma-aromaticity at the center of the Pd(3) triangle, which decreases from [Pd(3)Cl(3)](3-) to [Pd(3)I(3)](3-) (1 to 3) due to the softer character of the iodine counterpart, that donates extra charge to the ligands. The calculated electronic transitions via TD-DFT are in reasonable agreement with the experimental data obtained in CH(2)Cl(2) solution, indicating that the most intense transition involves a core-centered [Pd(3)X(3)](3) transition toward the [(C(7)H(7))(2)](2+) ligands, with mainly X(1-) character in the former molecular spinor that is responsible for the variation of the observed lambda(max) according to the variation of X(1-).
Authors:
A Muñoz-Castro; R Arratia-Pérez
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  114     ISSN:  1520-5215     ISO Abbreviation:  J Phys Chem A     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-16     Completed Date:  2010-07-08     Revised Date:  2011-01-03    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5217-21     Citation Subset:  -    
Affiliation:
Departamento de Ciencias Quimicas, Relativistic Molecular Physics (ReMoPh) group, Universidad Andres Bello, Republica 275, Santiago, Chile.
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Erratum In:
J Phys Chem A. 2010 Dec 23;114(50):13289

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