Abakumov, Artem M.

Dikarev, Evgeny V.

Navulla, Anantharamulu

Shpanchenko, Roman V.

Tsirlin, Alexander A.

Zhang, Haitao

Abstract: Hexafluoroacetylacetonates that contain lead and divalent first-row transition metals, PbM(hfac)4 (M = Ni (1), Co (2), Mn (3), Fe (4), and Zn (5)), have been synthesized. Their heterometallic structures are held together by strong Lewis acid 12base interactions between metal atoms and diketonate ligands acting in chelating 12bridging fashion. Compounds 1 125 are highly volatile and decompose below 350 \ub0C. Fluorinated heterometallic \u3b2-diketonates have been used for the first time as volatile single-source precursors for the preparation of mixed-metal fluorides. Complex fluorides of composition Pb2MF6 have been obtained by decomposition of 1 125 in a two-zone furnace under low-pressure nitrogen flow. Lead 12transition metal fluorides conform to orthorhombically distorted Aurivillius-type structure with layers of corner-sharing [MF6] octahedra separated by \u3b1-PbO-type (Pb2F2) blocks. Pb2NiF6 and Pb2CoF6 were found to exhibit magnetic ordering below 80 and 43 K, respectively. The ordering is antiferromagnetic, with a weak, uncompensated moment due to the canting of spins. The Pb2MF6 fluorides represent a new class of prospective magnetoelectric materials combining transition metals and lone-pair main-group cations

Fluorinated heterometallic <tex>\beta$</tex>-diketonates as volatile single-source precursors for the synthesis of low-valent mixed-metal fluorides

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