Einfluß von H-Brückenbindungen auf die Jahn-Teller-Verzerrung in den Kettenstrukturen von 2,2'-bipyMn(H2PO4)F2*H2O und 2,2'-bipyMn(H2PO4)2F

Ronald Stief (1) , Werner Massa (2)

1 Fachbereich Chemie
2 Fachbereich Chemie

In the system 2,2'-bipyridine/Mn(III)/HF/H3PO4/H2O two compounds with chain structures could be prepared and characterised by X-ray structure analyses. 2,2'-bipyMn(H2PO4)F2*H2O (1): monoclinic, twinned, space group P21/c, Z = 4, a = 6.7883(4), b = 10.9147(5), c = 17.8102(8) Å, b = 100.142(4)°, R = 0.0328. 2,2'-bipyMn(H2PO4)2F (2): triclinic, space group P , Z = 2, a = 6.675(1), b = 10.715(1), c = 11.013(1) Å, a = 107.595(9)°, b = 90.994(9)°, g = 95.784(8)°, R = 0.0252. Both compounds show chain structures with trans-bridging dihydrogenphosphate ligands and bipy and two fluorine ligands for (1), or bipy, fluorine and an additional dihydrogenphosphate, respectively, for (2) in equatorial positions. Due to the pseudo-Jahn-Teller effect, Mn(III) shows elongated octahedral coordination with ferrodistortive ordering along the chain direction. The distortion is remarkably higher in (1) than in (2). This is discussed in context with additional H-bonds along the chain in (2).

Mots clés: Physical Sciences

Ronald Stief, Werner Massa. Einfluß von H-Brückenbindungen auf die Jahn-Teller-Verzerrung in den Kettenstrukturen von 2,2'-bipyMn(H2PO4)F2*H2O und 2,2'-bipyMn(H2PO4)2F. Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie, 2010, 636 (15), pp.2617. ⟨10.1002/zaac.201000208⟩. ⟨hal-00599877⟩