(Bis(terpyridine))copper(II) Tetraphenylborate: A Complex Example for the Jahn-Teller Effect.
The surprisingly complicated crystal structure of (bis(terpyridine))copper(II) tetraphenylborate [Cu(tpy)2](BPh4)2 (tpy = 2,2':6',2″-terpyridine) consists of six crystallographically independent [Cu(tpy)2](2+) complexes. At ambient temperature, five out of six [Cu(II)N6] chromophores appear to be compressed octahedra, while at 100 K, four exhibit elongated and only two compressed octahedral geometry. Temperature dependent single crystal UV/vis (100, 298 K) and EPR measurements (20, 100, 298 K) as well as AOM calculations suggest that the octahedra which show apparently compressed octahedral geometry (XRD) result from dynamic Jahn-Teller behavior of elongated octahedra [Cu(II)N6]. The detailed correlation of structural and spectroscopic data allows an understanding of the strongly solvent-dependent structures of the [Cu(tpy)2](2+) complex in solution.
Institute of Physical and Theoretical Chemistry, University of Bonn , Wegelerstr. 12, Bonn, Germany.
Andreas
A
Meyer
Institute of Inorganic Chemistry, University of Bonn , Gerhard-Domagk-Str. 1, Bonn, Germany.
Gregor
G
Schnakenburg
Institute of Inorganic Chemistry, University of Bonn , Gerhard-Domagk-Str. 1, Bonn, Germany.
Robert
R
Glaum
Institute of Physical and Theoretical Chemistry, University of Bonn , Wegelerstr. 12, Bonn, Germany.
Olav
O
Schiemann