%0 Journal Article %1 Klein.1999 %A Klein, Axel %A Kasack, Volker %A Reinhardt, Ralf %A Sixt, Torsten %A Scheiring, Thomas %A Zalis, Stanislav %A Fiedler, Jan %A Kaim, Wolfgang. %D 1999 %J Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry %K complex complex;electrochem complex;iminoethylpyrazine complex;spectroelectrochem complex;transition copper crystal data dinuclear iminoethylpyrazine ligand metal prepn reduced structure structure;solvatochromism transition %N 4 %P 575--582 %T 2,5-Bis(1-phenyliminoethyl)pyrazine (bpip): A conjugated metal-metal bridging acceptor ligand and its homodinuclear complexes with low-valent metal centers %X Complexes of 2,5-bis(1-phenyliminoethyl)pyrazine (bpip), a sym. bis(bidentate) ligand which acts through two different chelate donor centers, one imine and one azine N atom per metal chelate site, have readily been obtained with Cr(CO)4, Mo(CO)4, W(CO)4, Mn(CO)3Cl, Re(CO)3Cl, Ru(bpy)22+ and Cu(PPh3)2+ fragments. The 'free' ligand and the dinuclear Cu(PPh3)22(m-bpip)BF42 were characterized crystallog. The low-energy mol. conformation of free bpip is qual. different from the planar syn/trans/syn arrangement required in the bpip-bridged dicopper(I) compd. (Cu···Cu distance 6.944 \AA). Structural preferences and the p acceptor properties of the conjugated bridging ligand bpip were studied using DFT calcns. of the bpip0/-/2- chromophore and combined electrochem. and spectroscopic methods; bpip is a stronger p acceptor than the related 2,5-bis(2-pyridyl)pyrazine but a poorer mediator of metal-metal interaction. on SciFinder(R)

@article{Klein.1999, abstract = {Complexes of 2,5-bis(1-phenyliminoethyl)pyrazine (bpip), a sym. bis(bidentate) ligand which acts through two different chelate donor centers, one imine and one azine N atom per metal chelate site, have readily been obtained with Cr(CO)4, Mo(CO)4, W(CO)4, Mn(CO)3Cl, Re(CO)3Cl, [Ru(bpy)2]2+ and [Cu(PPh3)2]+ fragments. The 'free' ligand and the dinuclear [{Cu(PPh3)2}2(\textgreek{m}-bpip)][BF4]2 were characterized crystallog. The low-energy mol. conformation of free bpip is qual. different from the planar syn/trans/syn arrangement required in the bpip-bridged dicopper(I) compd. (Cu···Cu distance 6.944 {\AA}). Structural preferences and the \textgreek{p} acceptor properties of the conjugated bridging ligand bpip were studied using DFT calcns. of the bpip0/-/2- chromophore and combined electrochem. and spectroscopic methods; bpip is a stronger \textgreek{p} acceptor than the related 2,5-bis(2-pyridyl)pyrazine but a poorer mediator of metal-metal interaction. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Klein, Axel and Kasack, Volker and Reinhardt, Ralf and Sixt, Torsten and Scheiring, Thomas and Zalis, Stanislav and Fiedler, Jan and Kaim, Wolfgang.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/23a5ae06d2d1d4164b9a6ede6de52ed35/huebleriac}, interhash = {6f37161932ca02525d5d732cd5914957}, intrahash = {3a5ae06d2d1d4164b9a6ede6de52ed35}, issn = {0300-9246}, journal = {Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry}, keywords = {complex complex;electrochem complex;iminoethylpyrazine complex;spectroelectrochem complex;transition copper crystal data dinuclear iminoethylpyrazine ligand metal prepn reduced structure structure;solvatochromism transition}, number = 4, pages = {575--582}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {2,5-Bis(1-phenyliminoethyl)pyrazine (bpip): A conjugated metal-metal bridging acceptor ligand and its homodinuclear complexes with low-valent metal centers}, year = 1999 }