Abstract
In the title compound [Fe(bpe)(Hbpe)Au(CN)2][Au(CN)2]2·bpe·2H2O} n [where bpe = 1,2-bis-(pyridin-4-yl)ethene, C12H10N2], the FeII ion is coordinated in a distorted octa-hedral [FeN4O2] environment by two di-cyano-aurate anions, two water mol-ecules and two partially protonated 1,2-di(4-pyrid-yl)ethyl-ene mol-ecules. Di-cyano-aurate anions bridge the FeII cations, forming infinite chains, which propagate along the a-axis direction. The chains are connected via aurophilic inter-actions with two non-coordinated di-cyano-aurate anions for each FeII ion. The polymeric chains inter-act with each other via π-π stacking between the guest bpe mol-ecules and multiple hydrogen bonds.
Highlights
In the title compound [Fe(bpe)(Hbpe)Au(CN)2][Au(CN)2]2ÁbpeÁ2H2O}n [where bpe = 1,2-bis(pyridin-4-yl)ethene, C12H10N2], the FeII ion is coordinated in a distorted octahedral [FeN4O2] environment by two dicyanoaurate anions, two water molecules and two partially protonated 1,2-di(4-pyridyl)ethylene molecules
Dicyanoaurate anions bridge the FeII cations, forming infinite chains, which propagate along the a-axis direction
The chains are connected via aurophilic interactions with two non-coordinated dicyanoaurate anions for each FeII ion
Summary
Iron(II) complexes exhibiting spin-crossover (SCO) properties attract considerable attention because of their fascinating ability to change multiple physical properties (magnetic, optical, mechanical, etc.) under the influence of external stimuli (Gutlich & Goodwin, 2004). These materials can be integrated into various devices as switches, triggers, chemical sensors, etc. FeII Hofmann clathrate (Hofmann & Hochtlen, 1903) analogues represent one of the biggest classes of SCO coordination compounds They are cyanobimetallic complexes of general formula [Fe(L)n{M(CN)x}y] in which the FeII ions are connected by bridging cyanometallic anions into infinite layers (n = 2 for monodentate ligands and n = 1 for bismonodentate ligands). We describe the crystal structure of a new cyanometallic FeII complex with bpe of general formula [Fe(bpe)(Hbpe)Au(CN)2](Au(CN)2)2ÁbpeÁ2H2O in which the FeII ions are stabilized in the high-spin (HS) state
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