Spectrophotometric studies on the solvatochromism of the Fe(CN)2(phen)2 complex

Solvatochromic and Ionochromic Effects of Iron(II)bis(1,10-phenanthroline)dicyano: a Theoretical Study

“…For certain classes of compounds these properties could be changed by the solvent environment or by the presence of metal ions in specific solution, producing solvatochromism and ionochromism, respectively. cis -Iron(II)-bis(1,10-phenanthroline)dicyano, Fe(phen) 2 (CN) 2 , exhibits significant solvatochromic and ionochromic band shifts in certain solutions. − Since such spectroscopic properties determine the sensor properties of this compound, they have been extensively studied using a variety of spectroscopic methods . The UV−vis bands of Fe(phen) 2 (CN) 2 have been used as an indicator of inorganic solvent polarity as a Lewis acid−base indicator for estimation of the acceptor numbers of cations in aqueous and nonaqueous solutions and as an indicator solute to monitor the effect of solute−solvent and solvent−solvent interactions on the preferential solvation characteristics. , Fe(phen) 2 (CN) 2 absorption band shift has been applied also for assessment of the unknown acceptor numbers of binary solvent mixture and to probe solvation in organized aqueous media such as micelles and microemulsions .…”

“…The presence of Na + , Li + and Mg 2+ ions in acetonitrile produces also increasing negative ionochromism (blue-shifts of UV−vis bands, 562, 549, and 521 nm) with respect to the pure solvent. Interestingly, such a shift does not occur in aqueous solution. , The absorption bands of Fe(phen) 2 (CN) 2 were interpreted in the literature as low-lying metal-to-ligand charge transfer transition (MLCT) from Fe II (electron rich atom with a d 6 electron configuration) to phen (electron-acceptor ligand with low-lying π* orbitals). For [Fe(phen) 3 ] 2+ and [Fe(bpy) 3 ] 2+ species, however, where cyano groups are missing, the solvatochromic effect is not observed .…”

Solvatochromism and solvation of transition metal complexes in ternary aqueous solvent media

“…Charge-transfer wavelengths (frequencies) give indications of the extent of complex-solvent interactions-there are generally correlations between m max values and solvent acceptor numbers (AN) [16,21,22], albeit sometimes with somewhat separated correlation lines for hydroxylic and for non-hydroxylic solvents (See e.g. pp.…”

Probing the surface polarity of inorganic oxides using merocyanine-type dyes derived from barbituric acid

“…7,22,23 In particular, the dicyano-bis-(1,10-phenanthroline)-iron(II) complex 1 is a well-established probe molecule for the determination of both the acceptor number AN and HBD ability a of metal ions, solvents, binary mixtures of solvents, polymers, particle surfaces, polymer-modified particles and ionic liquids. 7d-f,i,m, [24][25][26][27][28][29][30][31][32][33] In contrast, the HBA ability b of solvents, polymers, ionic liquids and surfaces can be quantified with 3-(4-amino-3-methylphenyl)-7-phenyl-benzo-[1,2-b:4,5-b 0 ]-difuran-2,6-dione (2) while p* can be identified using 4-tert-butyl-2-(dicyano-methylene)-5-[4-(diethylamino)benzylidene]-D 3 -thiazoline (3). 7d,e,i,34-37 Based on eqn (2)-(4), a, b, or p* can be individually derived from the UV/vis absorption maxima of the perichromic probe dyes 1-3.…”