title: Synthesis, crystal-structure determination and magnetic properties of two new transition-metal carbodiimides: CoNCN and NiNCN.
abstract: Synthesis, structure determination, and magnetic properties are reported for the metastable and crystal-chemically isotypic phases cobalt carbodiimide, CoNCN, and nickel carbodiimide, NiNCN, adopting the hexagonal system and space group P63/mmc (NiAs type) with interatomic distances of Co-N = 2.17 Angstrom and Ni-N = 2.12 Angstrom and an octahedral coordination of the transition-metal ions; the NCN(2-) units reveal the carbodiimide shape with two C=N double bonds. The low-susceptibility data go back to strong antiferromagnetic spin-spin coupling, similar to the behavior of the electronically related oxides CoO and NiO.
authors.affiliation: Institute of Inorganic Chemistry, RWTH Aachen University, D-52056 Aachen, Germany.
authors.forename: Manuel
authors.initials: M
authors.lastname: Krott
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Liu
authors.forename: Boniface P T
authors.initials: BP
authors.lastname: Fokwa
authors.forename: Manfred
authors.initials: M
authors.lastname: Speldrich
authors.forename: Heiko
authors.initials: H
authors.lastname: Lueken
authors.forename: Richard
authors.initials: R
authors.lastname: Dronskowski