Rhenium Complexes of Ligands Based on Stilbene – Synthesis, Characterization, ­Reactivity, and Conformational Analysis

Abstract

The imine ligand L 1 was prepared by the reaction of 4amino-4Ј-(dimethylamino)stilbene and 2-pyridinecarbaldehyde. The amine ligand L 2 was obtained in good yield by the reduction of L 1 with NaBH 4 . The complexes [ReX(CO) 3 -(L n )] (1a: X = Cl, n = 1; 1b: X = Br, n = 1; 2a: X = Cl, n = 2; 2b: X = Br, n = 2) were prepared through the reactions of equimolar solutions of the corresponding ligand and [ReX(CO) 3 (CH 3 CN) 2 ]. The complexes were characterized [a] 4404 Complexes [ReX(CO) 3 (L 1 )] (X = Cl, 1a and X = Br, 1b): To fac-[ReX(CO) 3 (CH 3 CN) 2 ] (100 mg, 0.26 mmol for X = Cl and 0.23 mmol for X = Br), an equimolar quantity of L 1 (84 mg for 1a and 75 mg for 1b) in ethanol (15 mL) was added. The solution was heated under reflux for 45 min. The black solid formed after cooling to room temp. was collected by filtration and dried under vacuum over CaCl 2 /KOH.

Zinc and copper complexes of stilbene iminopyridine ligands with η2-Olefin binding mode

“…3 absorption of an azo-based iminopyridine ligand upon complexation with ZnCl 2 [21]. As a continuation of our work, we are reporting herein the synthesis and full characterization of two iminopyridine-appended stilbene ligands L1, which has been reported in the literature during the ongoing of the present work [22], and L2 as well as the preparation of two new zinc(II) and copper(I) metal complexes with ligand L1 and a zinc(II) complex of ligand L2.…”

“…Details of the single crystal X-ray experiments and crystal data are summarized in Table 1. This ligand L1 has been prepared with a slight modification from the procedure described earlier [22].…”

Azobased iminopyridine ligands and their rhenium metal complexes: Syntheses, spectroscopic, trans-cis photoisomerization and theoretical studies

“…The rhenium center is surrounded by the bidentate iminopyridyl chelating fragment, three carbonyl groups, and a chlorine atom and its coordination sphere presents the expected, although slightly distorted, octahedral geometry. This minor distortion from the ideal octahedral geometry is caused by the formation of a five-membered chelate ring (the N-Re-N angle) [9]. (Table S2 and Figure S1 in supplementary information) [10][11][12].…”

Luminescent fac-[ReX(CO)3(phenyl-pyta)] (X = Cl, Br, I) complexes: influence of the halide ligand on the electronic properties in solution and in the solid state

“…It is generally considered that the presence of a chloride anion as ancillary ligand leads to superior photochemical stability. Bromide tricarbonyl rhenium(I) complexes have also been studied for their spectroscopic and photophysical properties in solution [11][12][13][14][15][16][17][18][19][20], in polymer films [20], and for use as potential luminophores for bioimaging [21][22][23]. Some of them have also been investigated for their capacity to act as photochemically CO-releasing molecules (Pho-toCORMs) [24,25].…”