A series of isostructural
homo- and heterolanthanide coordination
polymers of formula [Ln2(dcpa)3(H2O)]∞ with Ln = La–Gd have been obtained
by reactions in water between the lightest lanthanide chlorides and
the disodium salt of 4,5-dichlorophthalic acid (H2dcpa).
They present particularly high thermal stability for coordination
compounds (up to 400 °C). Their luminescent properties have been
studied in detail. Interestingly an insensitivity to water coordination
as well as a very strong effect of optical dilution is observed. Therefore,
molecular alloys with very high lanthanum concentration have been
prepared. Some of them present highly tunable and very intense luminescence.
For example, to the best of our knowledge, [Sm0.04La1.96(dcpa)3(H2O)]∞ presents
one of the highest overall quantum yields measured so far for a Sm3+-based coordination compound (Q
Sm
Ligand = 9.2%),
and [Nd0.03Sm0.14Eu0.03La1.8(dcpa)3(H2O)]∞ is one of
the brightest (12 Cd·m–2 under 0.75 mW·cm–2 UV flux) multiemissive visible and near-infrared
lanthanide-coordination polymers reported to date.
Highly luminescent and color-tunable stable colloidal suspensions of molecular alloys are reported. They are produced via a green synthetic route in ethanol medium. The mean hydrodynamic diameter of the colloids...
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