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Syntheses, structure, and magnetic properties of extended structured Cr(II) pentacyanopropenide compounds

Qiuying Zhu ; Atta M.) Arif ; Lars Öhrström (Institutionen för kemi- och bioteknik, Fysikalisk kemi) ; Joel S. Miller
JOURNAL OF MOLECULAR STRUCTURE (0022-2860). Vol. 890 (2008), p. 41-47.
[Artikel, refereegranskad vetenskaplig]

The reaction between [Cr-II(NCMe)(4)][BF4](2) and the different cations of [C-3(CN)(5)](-), i.e. [PPN](+) [PPN = bis(triphenylphosphoranylidene)ammonium] and [NMe4](+) in different solvents led to two different tri-solvated structures possessing Cr-II[C-3(CN)(5)](2): Cr-II [C-3(CN)(5)](2).2MeCN.H2O (1) and Cr-II[C-3(CN)(5)](2).(THF) 2THF (2). 2 possesses layers of mu-1, 1'-[C-3(CN)(5)](-) while 1 contain a three- and six-connected 3D pyrite network structure with mu(3)-1,1',3-[C-3(CN)(5)](-) trigonal nodes. Both compounds possess a tetragonally elongated distorted Cr(II) site. Magnetic susceptibility measurements between 5 and 300 K reveal significant antiferromagnetic interactions for both 1 and 2, with theta = -26 and -23 K, respectively, from a fit to the Curie-Weiss law. Upon a comparison to related and similarly structured materials the coupling increases as Cr-II > Fe-II > Mn-II. (C) 2008 Elsevier B.V. All rights reserved.

Nyckelord: Cyanocarbon; Magnetism; Extended network structure; Net

Denna post skapades 2009-01-15. Senast ändrad 2014-11-10.
CPL Pubid: 86830


Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Fysikalisk kemi (2005-2014)



Chalmers infrastruktur