Probing the Radialene-Character in Triplesalophen Ligands by Spectroscopic and Structural Analysis

Enhancing the ferromagnetic coupling in extended phloroglucinol complexes by increasing the metal SOMO–ligand overlap: synthesis and characterization of a trinuclear CoII3 triplesalophen complex

The better overlap of the SOMO with the central π-system in the CoII3 than in the CuII3 complex enhances the spin-polarization and thus the ferromagnetic coupling.

A pyrene based Schiff base probe for selective fluorescence turn-on detection of Hg2+ ions with live cell application

A novel pyrene based free thiol containing a Schiff base derivative PT1 was synthesized and reported as a fluorescence turn-on sensor for Hg²⁺ ions, via CHEF and excimer (PT1-PT1*) formation with live cell imaging.

Switching from antiferromagnetic to ferromagnetic coupling in heptanuclear [Mt6Mc]n+ complexes by going from an achiral to a chiral triplesalen ligand

The heptanuclear complexes [(chand^RR)₂M^t₆{Fe^II(CN)₆}]²⁺ (M^t = Mn^III, Fe^III) exhibit ferromagnetic interactions due to a more efficient spin-polarization mechanism compared to the complexes [(talen^t-Bu2)₂M^t₆{M^c(CN)₆}]ⁿ⁺ with antiferromagnetic interactions.

Simple pyridyl-salicylimine-based fluorescence "turn-on" sensors for distinct detections of Zn2+, Al3+ and OH- ions in mixed aqueous media

Simple pyridyl-salicylimine derivatives (F1, F2 and F3) are reported for the first time as fluorescence "turn-on" sensors for distinct detections of Zn(2+), Al(3+) and OH(-) ions in mixed-aqueous media CH3CN/H2O with volume ratios of 6/4 and 3/7 (at pH = 7 and 25 °C) via internal charge transfer (ICT), chelation enhanced fluorescence (CHEF), and deprotonation mechanisms. F1 and F2 show diverse turn-on sensing applications to Zn(2+), Al(3+) and OH(-) ions, but F3 exhibited the fluorescence turn-on sensing to Al(3+) and OH(-) ions in CH3CN/H2O (6/4; vol/vol). F1+Zn(2+) and F2+Zn(2+) complexes revealed the reversibilities and ratiometric displacements of Zn(2+) with ethylene diamine tetra acetic acid (EDTA) and Al(3+) ions, respectively, in CH3CN/H2O (6/4; vol/vol). On the other hand, F1, F2 and F3 in CH3CN/H2O (3/7; vol/vol) showed sensitivities only to Al(3+) ions but negligible selectivities to OH(-) ions. Stoichiometry of all sensor complexes were calculated as 1 : 1 by job's plots based on UV/Vis and PL titrations. The complex formation and binding sites of all sensor materials were well characterized by (1)H, (13)C NMR, and mass (FAB) spectral analysis. Detection limits were calculated from standard deviations and linear fitting calculations. The association constant (log K(a)) values of sensor complexes were evaluated from the fluorescence binding isotherms. The fluorescence decay constant (τ) values were estimated from time resolved fluorescence studies. Time, temperature, pH and solvent concentration effects towards sensor responses were fully investigated in this report.

Toward new classes of potent antibiotics: synthesis and antimicrobial activity of novel metallosaldach-imidazolium salts

Imidazolium salts (Im(+)-R(2)R(3)-Cl(-)) attached to the N,N'-bis(salicylidene)-(±)-trans-1,2-diaminocyclohexane (saldach) backbone (4a-f) have been designed and successfully applied for the synthesis of the corresponding mononuclear complexes with Mn(III) and Fe(III) ions. The molecular structures of the saldach ligands H2(R(1))2saldach(Im(+)-R(2)R(3)-Cl(-))2 (R(1) = H, tert-Bu, R(2) = H, Et, n-Bu, R(3) = H, Me) and their [M(III)Cl{(R(1))2saldach(Im(+)-R(2)R(3)-Cl(-))2}] (M = Mn, Fe) complexes have been established. The free ligands exist as the phenol-OH and not as the zwitterionic (imine)N-H(+)· · ·(-)O(phenol) tautomer. Antimicrobial activity of the target compounds revealed higher potent antibacterial activity against Salmonella aureus, B. subtilis while less effective against E. coli and C. albicans and inactivity against A. flavus. Compound (4d) and its Fe(III) complex (6d) exhibit remarkable extra-potent bactericidal activity.