Crystal Structures, Thermal Properties, and Biological Activities of a Series of Lanthanide Compounds with 2,4-Dichlorobenzoic Acid and 1,10-Phenanthroline

Abstract

A new family of binuclear lanthanide compounds of general formula [Ln(2,4-DClBA)3phen]2 (Ln(III) = Nd (1), Sm (2), Dy (3), Yb (4); 2,4-DClBA = 2,4-dichlorobenzoate; phen = 1,10-phenanthroline) have been synthesized and characterized by elemental analysis, molar conductance, infrared spectroscopy, ultraviolet spectra, thermogravimetric analysis, and single-crystal X-ray diffraction. On the basis of X-ray crystallography, compounds 2–4 belong to the triclinic crystal system, PI̅ space group. In compound 2, the Sm3+ ion adopted a distorted monocapped square-antiprism coordination geometry. Compounds 3 and 4 are isomorphous whose central ions (Dy3+ and Yb3+) formed a distorted square-antiprism geometry. The heat capacities of compounds 1–4 are measured using DSC technology and fitted to a polynomial equation by the least-squares method. The smoothed molar heat capacities and thermodynamic function data of compounds 1–4 relative to the reference temperature 298.15 K are then calculated. Meanwhile, these compounds exhibit in good antifungal activity against C. albicans, good antibacterial activity against S. aureus, and better antibacterial activity against E. coli. The fluorescence spectra of the samarium and dysprosium compounds behave as characteristic transitions of Sm(III) and Dy(III) ions.

A series of binuclear lanthanide(III) complexes: Crystallography, antimicrobial activity and thermochemistry properties studies

“…7 F 1 and 5 D 0 ? 7 F 2 transitions are observed, respectively [25]. The emission spectrum of complex 6 ( Fig.…”

“…6 F 7/2 (607 nm), and 4 G 5/2 ? 6 F 9/2 (651 nm) [23][24][25]. The characteristic absorption bands of Dy(III) ion in complex 4 ( Fig.…”

Crystal structure of [(3-carboxyl-1-(4-carboxylphenylmethylene)-2- oxidopyrinium-κ2O1,O2)chloride(pyrazino[2,3-f]-[1,10]phenanthroline- κ2N1,N2)copper], [Cu(C14H10NO5)Cl(C14H8N4)], C28H18ClCuN5O5

“…Nevertheless, it is still agreat challenget op redict the exact structures and composition of polymeric compounds assembled by coordination bonds and/or p-p interactions [3]. The 1,10-phenanthroline and its derivatives as ac andidate forn on-covalenti nteractionsh avea lready been employedt oc onstruct coordinationp olymers [4][5][6][7].…”

Synthesis, thermal study and some properties of Gd(III), Tb(III), Dy(III) and Er(III) complexes with 4,4′-bipyridine and dibromoacetates

“…These spectra are very similar. For all compounds, the m as (COO) [22][23][24]. For Er(III) compound, probably bridging non-completely equivalent bonds between Er(III) and carboxylate groups exists [25].…”