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RESEARCH PRODUCT

Structure and Magnetic Properties of the Ferromagnetic Cu3Cl126- Trimer in [(NH3C2H4)3NH]2Cu3Cl14

Roger D. WillettMingyi WeiCarlos J. Gómez-garcía

subject

CrystallographyFerromagnetismChemistryInorganic chemistryTetrahedronchemistry.chemical_elementTrimerGeneral MedicineCrystal structureMagnetic susceptibilityCopperSymmetry (physics)Ion

description

The crystal structure consists of a strongly hydrogen bonded network of tris(N-ethylammonium)ammonium cations, Cu3Cl12(6)- trimeric species, and Cl- anions. The Cu3Cl12(6)- trimers are formed by two distorted tetrahedral CuCl4(2)- anions linked to a central square planar CuCl4(2)- anion via semicoordinate Cu-Cl...Cu mu1 bridges. The central copper ion shows only small deviations from ideal D4h symmetry, while the terminal copper ions show a mild distortion from D2d symmetry with an average trans Cl-Cu-Cl angle of 136.0 degrees. The semicoordinate linkages provide a ferromagnetic exchange pathway between the copper ions with J/k = 6.91(3) K. Short Cl...Cl contacts (3.67-3.90 angstoms) lead to very weak antiferromagnetic coupling between the ferromagnetically coupled trimers.

yearjournalcountryeditionlanguage
2004-09-28ChemInform
https://doi.org/10.1002/chin.200439012