Layered lanthanide sulfate compounds with three different structures have been
prepared and characterized. The compounds [C10H10N2][La(SO4)2] 3 2H2O (I), [C10H10N2]
[La(SO4)2(H2O)2]2 (IIa), [C10H10N2][Pr(SO4)2(H2O)2]2 (IIb), [C10H10N2][Nd2(SO4)4
(H2O)2]2 (IIIa), [C10H10N2][Sm2(SO4)4(H2O)2]2 (IIIb), and [C10H10N2][Eu2(SO4)4
(H2O)2]2 (IIIc) have anionic lanthanide sulfate layers separated by protonated bipyridinemolecules.
The layers are formed by the connectivity between the lanthanide polyhedra and sulfate tetrahedra.
The formation of a two-dimensional La-O-La layer (Ia), Pr-O-Pr chains (IIb), and a tetramer
cluster (IIIa) is noteworthy. The compounds exhibit honeycomb (I), square (IIa, IIb), and
honeycomb (IIIa-IIIc) net arrangements, when the connectivity between the lanthanide ions is
considered. Optical studies indicate the observation of characteristic metal-centered emission at
room temperature. The Nd compound (IIIa) exhibits a two-photon upconversion behavior.
Layered lanthanide sulfate compounds with three different structures have beenprepared and characterized. The compounds [C10H10N2][La(SO4)2] 3 2H2O (I), [C10H10N2][La(SO4)2(H2O)2]2 (IIa), [C10H10N2][Pr(SO4)2(H2O)2]2 (IIb), [C10H10N2][Nd2(SO4)4(H2O)2]2 (IIIa), [C10H10N2][Sm2(SO4)4(H2O)2]2 (IIIb), and [C10H10N2][Eu2(SO4)4(H2O)2]2 (IIIc) have anionic lanthanide sulfate layers separated by protonated bipyridinemolecules.The layers are formed by the connectivity between the lanthanide polyhedra and sulfate tetrahedra.The formation of a two-dimensional La-O-La layer (Ia), Pr-O-Pr chains (IIb), and a tetramercluster (IIIa) is noteworthy. The compounds exhibit honeycomb (I), square (IIa, IIb), andhoneycomb (IIIa-IIIc) net arrangements, when the connectivity between the lanthanide ions isconsidered. Optical studies indicate the observation of characteristic metal-centered emission atroom temperature. The Nd compound (IIIa) exhibits a two-photon upconversion behavior.
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