[Ru₃(CN)₃(CO)₉]^3-: Building Block for Multimetallic Cages.

Area of Science:

• Inorganic Chemistry
• Coordination Chemistry
• Supramolecular Chemistry

Background:

• Metal-cyanide clusters are valuable building blocks in supramolecular chemistry.
• The synthesis of complex cage structures from simple precursors remains a key challenge.

Purpose of the Study:

• To introduce a novel cluster-ligand, [Ru3(CN)3(CO)9]3- ([1]3-), as a versatile precursor.
• To explore the synthesis of diverse μ-CN cage architectures using [1]3-.
• To characterize the structural diversity of the resulting metal-cyanide cages.

Main Methods:

• Synthesis of [Ru3(CN)3(CO)9]3- ([1]3-) from [Ru3(CO)12] and cyanide.
• Reaction of [1]3- with various metal ions (Cu+, Ni2+, Fe2+, Fe2+) to form cage structures.
• Structural characterization of the synthesized cages using appropriate analytical techniques.

Main Results:

• [1]3- was synthesized and demonstrated as a precursor to μ-CN cages.
• Formation of a prism cage [Ru6(μ-CN)3(CO)18]3- upon reaction with [Ru3(CO)12].
• Synthesis of an expanded prism {Cu3[Ru3(μ-CN)3(CO)9]2}3- with Cu(I) centers.
• Formation of double cages {M[Ru3(μ-CN)3(CO)9]2}4- (M = Ni, Fe) with octahedral metal centers.
• Synthesis of an interpenetrated super-tetrahedrane {Fe4(μ4-O)[Ru3(μ-CN)3(CO)9]4}4- with Fe(II).

Conclusions:

• The cluster-ligand [Ru3(CN)3(CO)9]3- is a highly effective building block for constructing diverse metal-cyanide supramolecular architectures.
• The synthetic strategy allows for controlled assembly of complex cages with varying metal ions and geometries.
• This work expands the library of accessible metal-cyanide cages with potential applications in materials science and catalysis.