Sm2 [Pt(CN)4]3⋅18H2O compounds exhibit a radiationless energy transfer from linear [Pt(CN)4]2− stacks (donors) to Sm3+ cations (acceptors). A Sm3+ emission is found, resulting from the lowest excited Sm3+ state (4G5/2–4F5/2). The energy transfer is a selective process, which has been investigated by polarized emission measurements on single crystals under high pressure. As donor state we identify the lowest excited state of the stacks (mainly emitting E⊥c polarized light) while the relevant acceptor state is the Sm3+ 4F3/2 state being the second excited state.
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