Metal-metal bonded diruthenium(II, III) assemblies with the polycyano anionic linkers N(CN)2-, C(CN)3-, and 1,4-dicyanamido-2,5-dimethylbenzene (DM-Dicyd2-): Syntheses, structures, and magnetic properties

H. Miyasaka, R. Clérac, C. S. Campos-Fernández, K. R. Dunbar

Research output: Contribution to journalArticlepeer-review

120 Citations (Scopus)

Abstract

The new metal-metal bonded diruthenium(II,III) compounds [Ru2(O2CCH3)4(μ-L)]∞ (L = N(CN)2-, 1; C(CN)3-, 2) and [{Ru2(O2CCH3)2 (mhp)2}2(μ-DM-Dicyd)] (3) (mhp = 2-oxy-6-methylpyridinate, DM-Dicyd = 1,4-dicyanamido-2,5-dimethylbenzene dianion) have been synthesized and fully characterized. Compounds 1 and 2 were synthesized by the reaction of [Ru2(O2CCH3)4 (NCCH3)2](BF4) with NaN(CN)2 and KC(CN)3, respectively. The "dimer-of-dimers", 3, was synthesized by a 2:1 reaction of [Ru2(O2CCH3)2(mhp) 2(MeOH)](BF4) with [As(Ph)4]2[DM-Dicyd]. Compound 1 crystallizes in the monoclinic space group C2/m with a = 10.174(2) Å, b = 13.016(3) Å, c = 7.0750(14) Å, β = 101.83(3)°, and Z = 2. Compound 2 crystallizes in the orthorhombic space group Fdd2 with a = 29.679(6) Å, b = 31.409(6) Å, c = 7.3660(15) Å, V = 6866(2) Å3, and Z = 16. In compound 1, dicyanamide anions (N(CN)2-) bridge the [Ru2(O2CCH3)4]+ units in an end-to-end bridging mode, thereby forming an alternating one-dimensional chain. In compound 2, two cyano groups of tricyanomethanide anion (C(CN)3-) are coordinated to independent [Ru2(O2CCH3)4]+ units to give a chain similar to that found in 1. The Ru-Ru bond distances in 1 and 2 are 2.2788(14) and 2.2756(5) Å, respectively, which are typical values for Ru2(O2CR)4Cl and [Ru2(O2CR)4]+ and [Ru2(O2CR)4]+ compounds. The Ru-N distances are 2.257(8) Å in 1 and 2.259(4) and 2.283(4) Å in 2. The temperature dependence of the magnetic susceptibilities of compounds 1-3 reveals a weak antiferromagnetic interaction between Ru2 units (S = 3/2) through each polycyano anionic linker: g = 2.16, zJ = -0.33 cm-1, D = 63.3 cm-1 for 1; g = 2.15, zJ = -0.22 cm-1, D = 58.0 cm-1 for 2; and g = 2.10, zJ = -0.90 cm-1, D = 75.0 cm-1 for 3.

Original languageEnglish
Pages (from-to)1663-1671
Number of pages9
JournalInorganic chemistry
Volume40
Issue number7
DOIs
Publication statusPublished - 2001 Mar 26
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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