Structural studies of [Pt(CNMe)4][M(mnt)2]n {M = Pd or Pt, mnt = [S2C2(CN)2]2–, n = 1 or 2}: structure-dependent paramagnetism of three crystal forms of [Pt(CNMe)4][Pt(mnt)2]2
Abstract
The reaction of [NEt4]2[Pt(mnt)2] {mnt = [S2C2(CN)2]2–} with [Pt(CNMe)4][PF6]2 gave the diamagnetic ‘stacked’ salt [Pt(CNMe)4][Pt(mnt)2]. In acetonitrile, nitromethane and nitropropane solution respectively, treatment of [NEt4][Pt(mnt)2] with [Pt(CNMe)4][PF6]2 yielded three different crystal forms of the salt of 1∶2 stoichiometry: [Pt(CNMe)4][Pt(mnt)2]2·2MeCN, [Pt(CNMe)4][Pt(mnt)2]2·MeNO2 and [Pt(CNMe)4][Pt(mnt)2]2. These show structure-dependent antiferromagnetism, reflecting differing arrangements of the formally platinate(III) anions [Pt(mnt)2]– within the crystal lattice. The palladium salts [Pt(CNMe)4][Pd(mnt)2] and [Pt(CNMe)4][Pd(mnt)2]2· 2MeCN are isomorphous with their platinum analogues.
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