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Fig. 6 Fluorescence quantum yields (/f) of RPd1, RPd1-Pd2+ and
RPd1-Pd0/PPh3 solutions (bar graph). Visual absorption (bottom) and
fluorescence (top) responses of RPd1 towards Pd2+ and Pd0/PPh3
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RPd1 only (1), RPd1 + PdCl2 (2), RPd1 + Pd(OAc)2 (3), RPd1 +
PdCl2 + PPh3 (4), RPd1 + Pd(OAc)2 + PPh3 (5), RPd1 + Pd(PPh3)4 +
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each Pd source, in ethanol–H2O (1 : 1, v/v, 25 1C) solution, lex = 530 nm.
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fluorometric and colorimetric responses towards both Pd2+
and Pd0-complexes. Moreover, it provides a convenient
method for residual palladium detection in reactors. On the
comparison of fluorescence quantum yield of RPd1-Pd2+ and
RPd1-Pd0, it might present an effective method to eliminate
the fluorescence quenching effect of ‘open-shell’ transition
metal ions by reduction.
This work was supported by NSF of China (20706008,
20725621 and 20876024), National Basic Research Program
of China (2009CB724706), Ministry of Education of China
(Program for Changjiang Scholars and Innovative Research
Team in University, IRT0711; and Cultivation Fund of the
Key Scientific and Technical Innovation Project, 707016).
11 The test paper was prepared by placing a filter paper (3 Â 0.5 cm2)
into a dichloromethane solution of RPd1 (5.0 Â 10À3 M) and then
drying it in the air. Reference: Z. H. Lin, S. J. Ou, C. Y. Duan,
B. G. Zhang and Z. P. Bai, Chem. Commun., 2006, 624.
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ꢀc
This journal is The Royal Society of Chemistry 2010
Chem. Commun., 2010, 46, 1079–1081 | 1081