607352-45-4Relevant academic research and scientific papers
Reactions of the dirhenium(II) complex Re2Cl4(μ -dppm)2 with pyridinecarboxylic acids. Examples of bidentate O,O versus N,O coordination and tridentate O,N,O coordination and structural isomers that contain the pyridine-2,
Chattopadhyay, Swarup,Fanwick, Phillip E.,Walton, Richard A.
, p. 5924 - 5931 (2003)
Pyridine-2-carboxylic acid, pyridine-2,3-dicarboxylic acid, and pyridine-2,4-dicarboxylic acid or their [(Ph3P)2N] + salts react with the triply bonded dirhenium(II) complex Re 2Cl4(μ-dppm)2/sub
Reactions of the triply-bonded complex cis-Re2(μ-O 2CCH3)2 Cl2-(μ-dppm)2 with pyridine carboxylic acids
Chattopadhyay, Swarup,Fanwick, Phillip E.,Walton, Richard A.
, p. 3617 - 3621 (2003)
The diamagnetic dirhenium(II) complexes Re2(pic)Cl 3(μ-dppm)2 (2), Re2(dipic)Cl 2(μ-dppm)2 (3), Re2(HnicO) 2Cl2(μ-dppm)2 (4) and Re 2(picO)2(μ-dppm)2 (5) that are formed by the reactions of cis-Re2(μ-O2CCH3) 2Cl2(μ-dppm)2 (1) with picolinic acid (Hpic), dipicolinic acid (H2dipic), 2-hydroxynicotinic acid (HnicOH) and 6-hydroxypicolinic acid (HpicOH) represent four different types of reaction products from the displacement of the cis acetate groups of 1. All four compounds have been characterized by X-ray crystallography. Compound 2 can be prepared more logically and in higher yield from Re2Cl 4(μ-dppm)2. Compound 3, which retains the same cis,cis coordination of μ-dppm ligands that is present in 1, is the third structural isomer of Re2(dipic)Cl2(μ-dppm)2; the other two, which are prepared from Re2Cl4(μ-dppm) 2, contain trans,trans and transmis ligation by the pair of μ-dppm ligands. Compounds 4 and 5 are the first dirhenium(II) compounds that contain bridging 2-pyridonate ligands; in 4 the carboxylic acid group of μ-HnicO does not coordinate, whereas the μ-picO ligands in 5 are bound in a tridentate fashion and, consequently, the two axial Re-Cl bonds of 1 have been replaced by axial Re-O (carboxylate) coordination. Complexes 3-5 have quite accessible oxidation chemistry as shown by cyclic voltammetric measurements.
