The gas-phase He I and He I1 excited UV PE spectra of several (X)(Y)OS~(CO)~~ cluster derivatives... more The gas-phase He I and He I1 excited UV PE spectra of several (X)(Y)OS~(CO)~~ cluster derivatives (X, Y = H, OR, SR, Cl, Br) are reported. A qualitative discussion of the spectral data has been made on the basis of MOs that predominantly represent @-Os bonds, ta-like nonbonding metallic pairs, or (pX)(pY)Os2 bridge bonds. Investigation of the He I1 spectrum was crucial for assignment. The similarity found between the spectrum of H20s3(CO)lo and those of the two series (H)(Y)Os3(CO),, and (Y)20s3(CO)lo points to a very similar bonding pattern in all the compounds. Evidence for a direct weak interaction between the two bridged osmium atoms via the t2*-like set has been reported. This source of &-Os bonding progressively reduces its importance on going from H20s3(CO)lo to (H)(Y)Os3(CO),, and (Y)20s3(CO)l,,. (1) (a) University of Padova. (b) CNR of Padova. (c) University of Torino.
General rights Copyright and moral rights for the publications made accessible in the public port... more General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
Since the first theoretical workds of the sixties (1) on LCAO techniques in polymer quantum chemi... more Since the first theoretical workds of the sixties (1) on LCAO techniques in polymer quantum chemistry, the field has known a rapid development.
... Groupe de Catalyse, Faculres LTniversitairer de Namur, 0-5000-Namur, Belgium and Joseph G. FR... more ... Groupe de Catalyse, Faculres LTniversitairer de Namur, 0-5000-Namur, Belgium and Joseph G. FRIPIAT and Jean Marie ANDRE Labo ratou ... 447 CHEMICAL PHYSICS LET ERS 1 October 1974 Solids, eds.iS Anderson, MW Roberts and PS Stone (Chapman and Hall, London ...
The gas-phase He I and He I1 excited UV PE spectra of several (X)(Y)OS~(CO)~~ cluster derivatives... more The gas-phase He I and He I1 excited UV PE spectra of several (X)(Y)OS~(CO)~~ cluster derivatives (X, Y = H, OR, SR, Cl, Br) are reported. A qualitative discussion of the spectral data has been made on the basis of MOs that predominantly represent @-Os bonds, ta-like nonbonding metallic pairs, or (pX)(pY)Os2 bridge bonds. Investigation of the He I1 spectrum was crucial for assignment. The similarity found between the spectrum of H20s3(CO)lo and those of the two series (H)(Y)Os3(CO),, and (Y)20s3(CO)lo points to a very similar bonding pattern in all the compounds. Evidence for a direct weak interaction between the two bridged osmium atoms via the t2*-like set has been reported. This source of &-Os bonding progressively reduces its importance on going from H20s3(CO)lo to (H)(Y)Os3(CO),, and (Y)20s3(CO)l,,. (1) (a) University of Padova. (b) CNR of Padova. (c) University of Torino.
General rights Copyright and moral rights for the publications made accessible in the public port... more General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
Since the first theoretical workds of the sixties (1) on LCAO techniques in polymer quantum chemi... more Since the first theoretical workds of the sixties (1) on LCAO techniques in polymer quantum chemistry, the field has known a rapid development.
... Groupe de Catalyse, Faculres LTniversitairer de Namur, 0-5000-Namur, Belgium and Joseph G. FR... more ... Groupe de Catalyse, Faculres LTniversitairer de Namur, 0-5000-Namur, Belgium and Joseph G. FRIPIAT and Jean Marie ANDRE Labo ratou ... 447 CHEMICAL PHYSICS LET ERS 1 October 1974 Solids, eds.iS Anderson, MW Roberts and PS Stone (Chapman and Hall, London ...
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