6533b820fe1ef96bd1279a25

RESEARCH PRODUCT

An unprecedented hetero-bimetallic three-dimensional spin crossover coordination polymer based on the tetrahedral [Hg(SeCN)4]2− building block

Xiaoyun HaoM. Carmen MuñozWenlong LanYong DouFrancisco Javier Valverde-muñozZhen ZhouQingyun LiuHui LiuDaopeng ZhangJosé Antonio Real

subject

Ligand field theoryMaterials scienceSpin statesCoordination polymerCrystal structureMagnetic-Properties010402 general chemistry01 natural sciencesCatalysisLIESSTParamagnetismchemistry.chemical_compoundSpin crossoverPressureMaterials ChemistrySpectroscopic investigationsPolynuclear complexesCrystal-StructureBehavior010405 organic chemistryMetals and AlloysGeneral Chemistry0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsCrystallographyOctahedronchemistryFISICA APLICADATransitionX-RayCeramics and CompositesHg(Scn)(4)(2-) UnitState

description

[EN] Self-assembly of octahedral FeII ions, trans-1,2-bis(4-pyridyl) ethane (bpe) bridging ligands and [Hg(XCN)(4)](2-) (X = S (1), Se (2)) tetrahedral building blocks has afforded a new type of hetero-bimetallic Hg-II-Fe-II spin-crossover (SCO) 3D 6,4-connected coordination polymer (CP) formulated {Fe(bpe)[Hg(XCN)(4)]}(n). For X = S (1), the ligand field is close to the crossing point but 1 remains paramagnetic over all temperatures. In contrast, for X = Se (2) the complex undergoes complete thermal induced SCO behaviour centred at T-1/2 = 107.8 K and complete photoconversion of the low spin state into a metastable high-spin state (LIESST effect) with T-LIESST = 66.7 K. The current results provide a new route for the design and synthesis of new SCO functional materials with non-Hoffmann-type structures.

yearjournalcountryeditionlanguage
2019-04-25Chemical Communications
https://doi.org/10.1039/c9cc01291e