Synthesis and characterization of bis(bipyridine)ruthenium(II) complexes with bromo or protected ethynyl β-diketonato ligands

Abstract

Keywords:Ruthenium(II) bipyridyl complex b-diketone complex Acetylenic compounds Mixed-ligand X-Ray structure Microwave irradiation synthesis a b s t r a c t A protected ethynyl group was introduced into a c-position of a (b-diketonato)bis(bipyridine)ruthenium(II) complex through the reaction of the bromo complex and (triisopropylsilyl)-acetylene with very good yield under microwave irradiation. Two new mononuclear mixed-ligand ruthenium(II) complexes with bipyridine (bpy) and functionalized acetylacetonate ion (2,4-pentanedionate, acac À ), [Ru(bpd)(bpy) 2 ](PF 6 ) (2; bpy = 2,2 0 -bipyridine, bpd = 3-Bromo-2,4-pentanedionate ion) and [Ru(tipsepd)(bpy) 2 ](PF 6 ) (3; tipsepd = 3-((triisopropylsilyl)ethynil)-2,4-pentanedionate ion) were then prepared as candidates for building blocks. The 1 H NMR, UV-Vis, electrochemistry and FAB mass spectral data of these complexes are presented. X-Ray single crystal diffraction analysis has been made on complex 2, it crystallized with empirical formula of C 25 H 22 BrF 6 N 4 O 2 PRu, in a monoclinic crystal system and space group C2/c with a = 29.340(5) Å, b = 13.282(2) Å, c = 15.7492 (14) Å, b = 109.452(8)°, V = 5786.9(13) Å 3 and Z = 8.

Synthesis and Characterization of a Series of Ruthenium Tris(β‐diketonato) Complexes by an UHV‐STM Investigation and Numerical Calculations

“…[49,50] The iodination or bromination selectively occurred at the γ-position of the acac ligand and led to compounds 5 and 6 in good yield (77 and 89 %, respectively); this was adapted from literature procedures. [51][52][53] Scheme 1. Synthesis of complexes 1-3.…”

Synthesis and characterization of β-diketonato ruthenium(II) complexes with two 4-bromo or protected 4-ethynyl-2,2′-bipyridine ligands

“…one can observed three transitions probably attributed to MLCT transitions as it has already been observed in mixed-ligand Ru(II) complexes with bpy and b-diketonato type ligand. [3] One can notice that the two bands around 580 and 530 nm collapse to just one band (570 nm) when going from 2-3 to 1. In the UV region, (cf Fig 2) there is mostly two strong bands for all compounds attributed to p p* intra ligand (IL) but two points have to be noted: When Because of its low solubility, we were not able to separate the isomeric forms for 1 by HPLC technique, and then NMR data for 1 was untreatable because of its complexity (see supplementary materials, Figure S6).…”

“…In the course of finding new building blocks for molecular electronics applications, [1,2] we turned to mixed-ligands ruthenium(II) complexes with 2,2 -bipyridine and b-diketonato ligands. [3] 2,2 -bipyridine is the most widely used ligand for many reasons. [4] Ruthenium(II) polypyridine complexes have been largely employed due to several intrinsic properties.…”

A Controlled Quantum SWAP Logic Gate in a 4-center Metal Complex

“…As required, this molecule is a non symmetric tetranuclear complex where all the peripheral ruthenium entities are different from each other due to their different coordination spheres (R 1 = R 2 = R 4 ). Several necessary chemical steps towards this target molecules have been made [11,12,13] The spin interaction between the electrons on sites M 1 and M 2 is described by an effective magnetic coupling by considering only two 1-qubits, one on each of the two target centers. The initial state is prepared within two paired electrons on the site M 4 and a single electron on each one of the sites M 1 , M 2 and M 3 .…”