Inorganic Chemistry
Article
with ligand L7 (Scheme 4).24 The design of new lipophilic
phenyl bridges following this strategy would therefore be highly
welcome for improving polymer luminescence. Finally, the
ultimate goal of producing a strict alternation of binding sites
occupied by two different lanthanides in a linear polymer
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Ln1,Ln2
Ln1,Ln1
Ln2,Ln2
Ln1,Ln2
requires that ΔE
= (ΔE
+ ΔE
)/2 − ΔE
mix
Ln1,Ln2
1−2
1−2
1−2
> 0, where ΔE
is the mixing intermetallic interaction.16b
mix
The latter condition is thought to be privileged for systems
displaying variable homometallic intersite interactions
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̈
21,19
Ln1,Ln1
1−2
ΔE
,
a trend maximized in going from Ln = Eu to
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Ln = Y for the investigated lanthanidopolymers [{Ln-
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̈ ̈
Heck, J. G.; Rudat, B.; Neumaier, M.; Feldmann, C.; Scheppers, U.;
(hfac)3}m(L4)] (Ln = La, Eu, Y).
Brase, S.; Roesky, P. W. J. Am. Chem. Soc. 2013, 135, 7454−7457.
̈
developments.
ASSOCIATED CONTENT
* Supporting Information
■
S
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Details for the determination of occupancy factors and binding
isotherms (appendices 1 and 4), for the analysis of the crystal
structure of [La(hfac)3(L3Ph)] (appendix 2), for the calcu-
lations of molecular weight distributions (appendix 3), and for
the correction of electronic absorption spectra (appendix 5).
Tables of crystal data, geometric parameters, bond valences,
and thermodynamic descriptors. Figures showing molecular
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1
structures, H NMR spectra and titrations, ESI mass spectra,
SEC chromatogramms, binding isotherms, electronic absorp-
tion, and emission spectra. A CIF file for [La(hfac)3(L3Ph)].
This material is available free of charge via the Internet at
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AUTHOR INFORMATION
Corresponding Author
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■
Author Contributions
§The first two authors contributed equally to this research
work.
Notes
The authors declare no competing financial interest.
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ACKNOWLEDGMENTS
Financial support from the Swiss National Science Foundation
is gratefully acknowledged.
■
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REFERENCES
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