Crystal structures, luminescent and thermal properties of lanthanide complexes with 3,4-dimethylbenzoic acid and 2,2′-bipyridine

Shen, Pan-Pan; Ren, Nanqi; Zhang, Jianjun; Geng, Lin; Wang, Shuping; Shi, Shikao

doi:10.1007/s10973-017-6643-3

Cited by 5 publications

(1 citation statement)

References 36 publications

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“…Also, they are used as antimicrobial, antitumor [16], anticancer [17], antioxidant [18], antiproliferatial [19] and chemotherapeutic agent [20]. Lanthanides and actinides and their complexes have attracted a great interest as a results of their antimicrobial, antioxidant, antitumor, DNA binding, electro-optical, nephelauxetic, luminescent properties [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Pyrrole is important heterocyclic compound, where porphyrins (haem), chlorines (chlorophyll) and corrin (vitamin B12) contain pyrrole ring [36].…”

Section: Introductionmentioning

confidence: 99%

pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals

et al. 2020

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The reaction of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with trivalent 4f lanthanide metal ions (La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III), Dy(III), Ho(III), Er(III) and Yb(III)) and 5f actinide metal ion UO 2 (II) has been studied potentiometrically in 75% (v/v) dioxane-water; at 283, 293, 303 and 313K. The ligand behaves as mono-protic species with the dissociation of hydrazo group proton and reacts with metal ion in molar ratio 1:2; M:L in solution. The formation constants were caulculated, which decrease as temprerature increases. The negative values of ΔH  and ΔG° indicate that the complexation process is exothermic and proceeds spontaneously, respectivily. The electrostatic forces are weaker than non-electrostatic forces, where-G°n on is lower than-G°e l. G°e l has negative comparable values and suggests that the complexation process is affected by the temperature and environment. The higher negative value of H  1non than H  2non for UO 2-complex would reflect that the bond strength from ligand to UO 2 ion, which is stronger in the 1 st coordination than the 2 nd coordination.

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