Kinetic and thermodynamic products in the reaction of poly(dichlorodicarbonylruthenium) with pyridinecarbaldimine ligands and the crystal structure of trans-Cl2Ru(CO)2(N-(pyrid-2-ylmethoxymethyl)(3-isopropoxypropyl)amine)

Abstract

Kinetic and Thermodynamic Products in the Reaction of [RuC12(CO)2]" with Pyridinecarbaldimine Ligands and the Crystal Structure of frav7S-CI2Ru(CO)2(N-(pyrid-2-ylmethoxymethyl)(3-isopropoxypropyl)amine

Syntheses, Structures, and Spectroscopic Properties ofcis,cis-andtrans,cis-[Ru(I)(Me)(CO)2(α-diimine)] Complexes

“…[44] The bite angle of 76.8(2)°, form selectively stereoisomers. [42] It will be shown that in the case of the complexes under study only one of the pos-which causes the deviation from a regular octahedral structure, has also been found for these complexes. The RuϪMe sible four stereoisomers presented in Figure 1 [43] Crystal Structure of cis,cis-[Ru(I)(Me)(CO) 2 (iPr-DAB)]…”

“…The 1 H-NMR spectrum of cis,cis-[Ru(Cl) 2 (CO) 2 (R-PyCa)], with the chloride trans to the imine moiety, shows a resonance for H 6 , which is shifted down field by approximately 0.5 ppm with respect to that of H 6 in the trans,cis-[Ru(Cl) 2 (CO) 2 (R-PyCa)] complex. [42] This shift is not found for cis,cis-[Ru(I)(Me)(CO) 2 (dmb)], and these signals are accordingly assigned to the latter conformation, with the methyl in an equatorial and the iodide in an axial position.…”

“…[40] [41] This shift is most probably due to through-space interaction between the methyl and the iodide, when these ligands are in a cis position. [42] Electronic Absorption Spectra…”

Reversible methanol addition to copper Schiff base complexes: a kinetic, structural and spectroscopic study of reactions at azomethine CN bonds

“…[6][7][8] An attractive feature of this ligand class is the facile synthesis of the imine (-CvN-) through the condensation of primary amines with aldehydes, which allows great variety in the substituent groups on both precursors, Scheme 1. 5,[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Additionally, a transient hemiaminal was also observed crystallographically during the formation of an imine bond in a Zn(II) metal organic framework (MOF). While the solvent is presumed to be non-reactive, there is growing evidence that certain azomethine chelates are susceptible to alcoholysis generating metal-coordinated hemiaminal ethers, which have been structurally characterized.…”

Isomerismo cis-trans: de Werner aos nossos dias

“…A síntese de uma série de isômeros geométricos pode envolver grandes dificuldades e um considerável volume de trabalho, uma vez que a estereoquímica dos isômeros é muitas vezes controlada por pequenas alterações nas condições de reação, que precisam ser cuidadosamente selecionadas e rigorosamente mantidas 26,27 . Temperatura, solvente e tempo de reação costumam apresentar-se como fatores determinantes na obtenção de isômeros geométricos distintos.…”