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The objective of this research is to evaluate and optimize machining parameter of tool electrode vibration on micro-electric discharge machining of polycrystalline diamond. The machining parameters evaluated are charge voltage, capacitance, and vibration of the tool electrode. An orthogonal array, signal-to-noise ratio, and analysis of variance are employed to analyze the effect of these machining parameters. The results show that by application of vibration on tool electrode in machining of polycrystalline diamond, it has significant effect up to 66.48% in increasing material removal rate without increasing surface roughness and tool electrode wear. Using Taguchi method for design of experiment, other significant effects on surface quality and tool electrode wear are also investigated. The results also show that surface roughness is mostly affected by the amount of capacitance (52.24%), and the tool electrode wear is also affected by the amount of capacitance (92.82%).

The diiridium(I) μ-hydroxo complex [Ir(μ-OH)(cod)] 2 (1; cod = 1,5-cyclooctadiene) readily reacted with aqueous NaOH in DMSO-d 6 or NaN(SiMe 3 ) 2 in THF to give the anionic trinuclear iridium oxo complex Na[{Ir(cod)) upon recrystallization from THF−hexane. Reactions of 2 with group 11 metal electrophiles (AuCl(PPh 3 ), AgCl(PPh 3 ), and AgCl) afforded iridium−gold and −silver mixed-metal cluster complexes [{Ir(cod)} 3 (μ 3 -O) 2 M(PPh 3 )] (3a: M = Au; 3b: M = Ag) and [Na(dmso) 3 (μ-dmso)] 2 [{Ir(cod)} 3 (μ 3 -O) 2 Ag(μ-Cl)] 2 (4) containing Ir(I) → Au(I)/Ag(I) dative interactions as revealed by DFT and NBO analysis. These results demonstrate the ability of 2 to act as an iridium(I)-centered σ-donor ligands to the group 11 metal centers. Single-crystal X-ray structures of 2•(THF) 2 (H 2 O), 3a, 3b, and 4 are presented.

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