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Title: Synthesis and nonlinear optical properties of new heptapentaenylidene complexes: Study on the second harmonic generation efficiencies of amino-substituted group 6 cumulenylidenes
Authors: Roth, G ×
Fischer, H
Meyer-Friedrichsen, T
Heck, J
Houbrechts, Stephan
Persoons, Andre #
Issue Date: Jan-1998
Publisher: Amer chemical soc
Series Title: Organometallics vol:17 issue:8 pages:1511-1516
Abstract: Reaction of the ynamine MeC=CNEt2 with the pentatetraenylidene complexes [(CO)(5)-M=C=C=C=C=C(NMe2)(2)] (M = Cr (3a), W (3b)) at room temperature affords the new heptapentaenylidene complexes [(CO)(5)M=C=C=C=C=C(NEt2)C(Me)=C(NMe2)(2)] (M = Cr (5a), W (5b)) in good yield. The spectroscopic data and the X-ray structural analysis of 5a indicate that these amino-substituted metallacumulenes are best described as hybrids of a cumulene and several strongly polarized alkynyl structures. For 5a and the related metallacumulenes [(CO)(5)M=C=C=C(NMe2)(2)] (M = Cr (1a), W (1b)), [(CO)(5)Cr=C=C=C(NEt2)C(H)=C(NMe2)(2)] (2a), and 3a,b the molecular first hyperpolarizability beta was determined by hyper-Rayleigh scattering experiments. The insertion of a cumulated Ct unit into a metallacumulene quadruples beta, while the insertion of a conjugated C-2 unit results in only slight enhancement of the second harmonic generation response. Substitution of tungsten for chromium has only a minor effect on beta. All observed beta values are reasonably high compared with those of other organometallic compounds.
ISSN: 0276-7333
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
× corresponding author
# (joint) last author

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