Metallic Carbonyl Complexes Containing Heterocycle Nitrogen Ligands. 2. Tricarbonylbromo(3,3'-R-2,2'-biquinoline)Rhenium(I) Compounds

Abstract

Several BrRe(CO)3L complexes (where L groups are 2,2'-biquinoline substituted in the 3 and 3' positions) were prepared. Their pseudooctahedralfuc structure was established by using FTIR, UV-vis, and 1H-NMR and confirmed by X-ray analysis. A good correlation between the electrochemical parameters and the MLCT electronic transition was found. The crystalline compound, BrRe(C0)3(3,3'-trimethylene-2,2'-biquinoline) belongs to triclinic space groupPiwitha=9,113(11)A,b= 10.192(4)A,c= 12.825(5)A,ar=73.23(4)0,B=81.30(7)0,andy=66.55(5)0.The volume of the unit cell is 1048(1) A3 with Z = 2. The structure was refined to R = 0.040.

Ligand dependence of magnetic spin effects on photooxidation of [Ru(bpy)3−n(CN)2n](+2−2n) type complexes

“…However, the difference is sufficient to evaluate a meaningful value of k fet , the first-order rate constant of forward electron transfer in the encounter pair. In H 2 O and D 2 O these values show a general tendency to increase with the number of CN ( ligands, which parallels the trend in the increasing driving force (/ (DG fet ; cf. Table 1).…”

“…2 ] the parameter sets correspond to well defined global minima of the fitting procedure. However, no unique fits were obtained for the tetracyano complex because of the small MFEs and the weak curvature.…”

A Novel Organometallic ReI Complex with Favourable Properties for Bioimaging and Applicability in Solid‐Phase Peptide Synthesis

“…This situation can be explained in terms of a triplet metal-to-ligand charge transfer ( 3 MLCT) luminescence, which is characterized by large Stokes shifts and is already well known for rhenium(I) tricarbonyl bis(imine) [40,41] and bis(quinoline) [42] complexes. With use of water as a solvent, the emission wavelengths of compounds 5 and 6 shift further into the red.…”

Spectroscopic and electrochemical properties of heteroleptic cationic copper complexes bis-(diphenylphosphino)alkane-(2,2′-biquinoline)copper(I). Crystal structure of bis(diphenylphosphino)ethane-(2,2′-biquinoline)copper(I) perchlorate

“…The chemical shift (d in ppm) and Dd (d complex À d biq ) data for 1 H, of the free ligands and their corresponding complexes are summarized in Table 4. 1 H NMR signals pattern for biquinoline ligands are well known [19][20][21][22], corresponding to six aromatic resonances distributed in two doublets for AX spin system formed by H 3 and H 4 protons, and in a spin system formed by the remaining protons which are observed as two doublets for H 5 and H 8 , and two double-doublet (observed as a pseudo triplet) for H 6 , H 7 , protons (Table 4). However, the chemical shift for each proton in 2,2 0 -biquinoline is very sensitive to the distribution of the rest of the ligands in a complex.…”