title: The Tetracyanopyridinide Dimer Dianion, σ-[TCNPy]2 (2.).
abstract: The reaction of 2,3,5,6-tetracyanopyridine (TCNPy) and Cr(C6 H6 )2 forms diamagnetic σ-[TCNPy]2 (2-) possessing a 1.572(3) Å intrafragment sp(3) -sp(3) bond. This is in contrast to the structurally related 1,2,4,5-tetracyanobenzene and 1,2,4,5-tetracyanopyrazine that form π-dimer dianions possessing long, multicenter bonds.
authors.affiliation: Material Research Science and Engineering Center, Department of Chemistry, University of Utah, Salt Lake City, UT, 84112-0850, USA.
authors.forename: Jingjun
authors.initials: J
authors.lastname: Hao
authors.affiliation: Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA, 92093-0358, USA.
authors.forename: Arnold L
authors.initials: AL
authors.lastname: Rheingold
authors.affiliation: Material Research Science and Engineering Center, Department of Physics and Astronomy, University of Utah, Salt Lake City, UT, 84112-0830, USA.
authors.forename: Marzieh
authors.initials: M
authors.lastname: Kavand
authors.affiliation: Material Research Science and Engineering Center, Department of Physics and Astronomy, University of Utah, Salt Lake City, UT, 84112-0830, USA.
authors.forename: Kipp J
authors.initials: KJ
authors.lastname: van Schooten
authors.affiliation: Material Research Science and Engineering Center, Department of Physics and Astronomy, University of Utah, Salt Lake City, UT, 84112-0830, USA.
authors.forename: Christoph
authors.initials: C
authors.lastname: Boehme
authors.affiliation: Departament de Química Física and IQTCUB Facultat de Química, Universitat de Barcelona, 08028, Barcelona, Spain.
authors.forename: Marçal
authors.initials: M
authors.lastname: Capdevila-Cortada
authors.affiliation: Departament de Química Física and IQTCUB Facultat de Química, Universitat de Barcelona, 08028, Barcelona, Spain.
authors.forename: Juan J
authors.initials: JJ
authors.lastname: Novoa
authors.affiliation: Institute of Inorganic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040, Linz, Austria.
authors.forename: Eva
authors.initials: E
authors.lastname: Wöss
authors.affiliation: Institute of Inorganic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040, Linz, Austria.
authors.forename: Günther
authors.identifier: http://orcid.org/0000-0002-2259-6496
authors.initials: G
authors.lastname: Knör
authors.affiliation: Material Research Science and Engineering Center, Department of Chemistry, University of Utah, Salt Lake City, UT, 84112-0850, USA. jsmiller@chem.utah.edu.
authors.forename: Joel S
authors.identifier: http://orcid.org/0000-0001-5743-8327
authors.initials: JS
authors.lastname: Miller
keywords: bonding; crystal structure; cyanides; cyanocarbon; radical ions