The use of amidinate ligands in paddlewheel diruthenium chemistry

B–B vs. B–H Bond Activation in a (μ‐Hydrido)diborane(4) Anion upon Cycloaddition with CO2, Isocyanates, or Carbodiimides

“…Instead, we observe a singlet resonance at δ ( 1 H)=8.07 ppm (1 H), showing a cross‐peak to a signal at δ ( 13 C)=158.8 ppm in the 1 H‐ 13 C HSQC experiment. The associated C−H moiety is obviously not part of an aryl ring or an alkyl group, but can rather be assigned to a formic acid derivative [36, 37] . Apart from the higher symmetry of K[ 3 ] compared to the CO 2 cycloadduct K[ 2 H], a notable upfield shift of the resonance assignable to H‐1 becomes evident (K[ 3 ]: 7.77 ppm vs. K[ 2 H]: 8.15/8.04 ppm; cf.…”

N-Heterocyclic carbene–carbodiimide (NHC–CDI) betaine adducts: synthesis, characterization, properties, and applications

“…Amidinates are p-electron rich chelating ligands, whose coordination chemistry has been extensively studied across the periodic table. [17][18][19][20][21][22] These complexes have seen applications in homogenous catalysis 46 (in particular, olen polymerization 19,47 ). Amidinates are the nitrogen-analogues of carboxylates, containing two nitrogen atoms that can coordinate to metals as monodentate, bidentate, or bridging ligands (Fig.…”

“…46,48,49 As bridging ligands, amidinates can generate bimetallic "paddlewheel" complexes in both trigonal and tetragonal modes. 18,[50][51][52] It is well known that tuning the amidinyl substituents can have a profound effect on the binding modes of these ligands.…”

“…Amidinates are considered the nitrogen analogues of carboxylates. 17 They act as coordinating ligands and feature a wide range of coordination modes; many amidinate complexes of transition metals, [18][19][20] lanthanides, 17 actinides, 21 and main group elements 22 have been reported. One important difference compared to carboxylate ligands is that the nitrogen atoms in amidinates nearly always carry an additional substituent, which allows for ne-tuning of the electronic and steric properties of the ligand system.…”

Ultrasound-assisted synthesis of water-soluble monosubstituted diruthenium compounds

“…Since mid-1960’s when Stephenson and Wilkinson [1] described the synthesis of the first mixed-valent [Ru 2 Cl(O 2 CR) 4 ] (R = alkyl) compound and Cotton and col [2] the first crystal structure, a big number of Ru 2 5+ paddlewheel diruthenium complexes with Ru-Ru bond order of 2.5 have been synthesized and characterized [3] , [4] , [5] , [6] , [7] , [8] . These compounds have attracted interest for their practical applications in catalysts [9] , [10] , [11] , [12] , [13] , [14] , [15] , [16] , biomedicine [17] , [18] , [19] , [20] , biotechnology [21] , [22] , [23] , [24] , [25] , [26] or by their potential in material science due to their unique magnetic [27] , [28] , [29] , [30] , [31] , [32] , [33] , [34] , [35] , [36] and redox properties [37] .…”