Transition metal complexes with the thiosemicarbazide-based ligands Part X. The complexes of UO 2(II) with S-methyl-1,4-bis(salicylidene)-isothiosemicarbazide (H 2L): [UO 2(L)A] (A = MeOH, EtOH, DMF). Crystal structure of [UO 2(L)DMF]

• Published in: Inorganica Chimica Acta Vol. 162; no. 2; pp. 277 - 280
• Main Authors: Leovac, V.M., Ivegeš, E.Z., Galešić, N., Horvatić, D.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 1989
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/S0020-1693(00)83160-6

The complexes of general formula [UO 2(L)A] (L = the dianion of quadridentate ONNO ligand S-methyl-1,4-bis(salicylidene)isothiosemicarbazide; A = MeOH, EtOH, DMF) were synthesized. The complexes containing MeOH and EtOH were obtained by the reaction of UO 2(OAc) 2·2H 2O with salicyl- aldehyde S-methylisothiosemicarbazone and salicyl- aldehyde in MeOH and EtOH, respectively, while the complex containing DMF was synthesized by recrystallization of the MeOH complex from DMF. [UO 2- (L)DMF] crystallizes in the monoclinic space group P2 1/ c with cell constants: a = 11.937(4), b = 14.514(4), c = 13.008(5) Å, β = 104.93(2)°, V = 2178(1) Å 3; M r = 654.48, Z = 4, D m = 2.00, D c = 1.996 g cm −3. The final R value for 1134 observed reflections is 0.043. The U coordination environment is a distorted pentagonal bipyramid with the uranyl O atoms [UO 1.74(1) and 1.73(1) Å] in apical positions. The equatorial plane is defined by the two salicyl- aldehydate O atoms [UO 2.20(2) and 2.27(2) Å], two isothiosemicarbazide N atoms [UN 2.54(2) and 2.59(2) Å] from the chelate ligand and by the dimethylformamide O atom at 2.35(2) Å. The uranyl group is slightly bent [OUO 175.8(8)°] toward the N coordinated atoms. Presumably the alcohol complexes also have a pentagonal bipyramidal configuration.