title: Synthesis, crystal structure, and properties of MnNCN, the first carbodiimide of a magnetic transition metal.
abstract: Synthesis, single-crystal structure determination, and magnetic properties are reported for manganese carbodiimide, MnNCN. The presumably unstable but inert phase adopts the trigonal system (R3m) with a = 3.3583(4) A, c = 14.347(2) A, V = 140.13(3) A3, and Z = 3. Divalent manganese is octahedrally coordinated by nitrogen atoms at 2.26 A, and the NCN(2-) unit adopts the linear [N=C=N](2-) carbodiimide shape with two C=N double bonds of 1.23 A. MnNCN contains high-spin Mn(II) with five unpaired electrons and behaves like an antiferromagnet with an ordering temperature below 30 K.
authors.affiliation: Institut für Anorganische Chemie der RWTH Aachen, Landoltweg 1, D-52056 Aachen, Germany.
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Liu
authors.forename: Manuel
authors.initials: M
authors.lastname: Krott
authors.forename: Paul
authors.initials: P
authors.lastname: Müller
authors.forename: Chunhua
authors.initials: C
authors.lastname: Hu
authors.forename: Heiko
authors.initials: H
authors.lastname: Lueken
authors.forename: Richard
authors.initials: R
authors.lastname: Dronskowski