title: Photoswitchable heterotrimetallic chain based on octacyanomolybdate, copper, and nickel: synthesis, characterization, and photomagnetic properties.
abstract: Taking into account the general interest in photoswitchable nanomagnets, we present an original synthetic route to well-defined photoswitchable heterotrimetallic complexes. Our strategy demonstrates the feasibility of using a "molybdenum-copper" switchable complex with terminal cyanide ligands as relevant synthons for the rational design and synthesis of heterotrimetallic photoswitchable molecular architectures. Starting from a pentanuclear compound based on an octacyanometalated precursor, [MoIV(CN)4(CNCuII(Me2en)2)4]4+, and a [NiII(cyclam)]2+ assembling building block, we succeeded in synthesizing a photoswitchable heterotrimetallic chain, denoted as {NiMo2Cu7}n. The compound has been characterized by single-crystal X-ray diffraction, UV-vis and IR spectroscopies, and powder magnetic and photomagnetic susceptibility measurements. Before irradiation, the compound behaves as a paramagnet with eight independent spin carriers (CuII d9, S = 1/2, and NiII d8, S = 1). After irradiation, a long-lived metastable state persists until relatively high temperature (120 K) and is thermally reversible.
authors.affiliation: Laboratoire de Chimie Inorganique et Matériaux Moléculaires, CNRS UMR 7071, Université Pierre et Marie Curie, case 42, 4 place Jussieu, 75 252 Paris, France.
authors.forename: Jérôme
authors.initials: J
authors.lastname: Long
authors.forename: Lise-Marie
authors.initials: LM
authors.lastname: Chamoreau
authors.forename: Corine
authors.initials: C
authors.lastname: Mathonière
authors.forename: Valérie
authors.initials: V
authors.lastname: Marvaud