title: Ligand dependent topology and spontaneous resolution in high-spin cyano-bridged Ni3W2 clusters.
abstract: Two high-spin pentanuclear NiW clusters with diimine blocking ligands have been obtained: {[Ni(4,4'-MeObpy)2]3[W(CN)8]2}·12H2O (1) and {[Ni(phen)2(H2O)][Ni(phen)2]2[W(CN)8]2}·7H2O (2) (4,4'-MeObpy = 4,4'-dimethoxy-2,2'-bipyridine, phen = 1,10-phenanthroline). Despite the similarity of the building blocks and synthetic conditions the compounds show different topologies of the cluster core: 1 is a trigonal bipyramid while 2 is a decorated square. Both cluster structures are chiral with either ΔΔΔ or ΛΛΛ configuration around all three Ni centres. In 1 spontaneous resolution occurs and it crystallises in the P212121 space group forming a conglomerate containing both types of enantiomorphic crystals. 1Δ and 1Λ are the first pair of enantiomorphic structures of cyano-bridged clusters of trigonal bipyramidal topology obtained with achiral bidentate blocking ligands. 2 crystallises as a racemic compound in a centrosymmetric space group P1[combining macron] with both enantiomers present in the structure. 2 is an exceptional square-motif containing structure with an identical stereoconfiguration of all complex cations within one cluster. Ferromagnetic interactions are present in both clusters resulting in the ground spin state S = 4.
authors.affiliation: Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland. beata.nowicka@uj.edu.pl.
authors.forename: Beata
authors.initials: B
authors.lastname: Nowicka
authors.affiliation: Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland. beata.nowicka@uj.edu.pl.
authors.forename: Mateusz
authors.initials: M
authors.lastname: Reczyński
authors.affiliation: Institute of Physics, Jagiellonian University, Łojasiewicza 11, 30-348 Kraków, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Rams
authors.affiliation: Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland.
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Wasiutyński
authors.affiliation: Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland. beata.nowicka@uj.edu.pl.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Nitek
authors.affiliation: Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland. beata.nowicka@uj.edu.pl.
authors.forename: Barbara
authors.initials: B
authors.lastname: Sieklucka