Crystal structure of bis(acetato-κ² O,O′)diaqua[1-(pyridin-2-ylmethylidene-κN)-2-(pyridin-2-yl-κN)hydrazine-κN ¹]terbium(III) nitrate monohydrate

Abstract

In the title compound, [Tb(C2H3O2)2(C11H10N4)(H2O)2]NO3·H2O, the Tb3+ ion is nine-coordinated in a distorted tricapped trigonal-prismatic geometry by the three N atoms of the tridentate 1-(pyridin-2-ylmethylidene)-2-(pyridin-2-yl)hydrazine ligand, four carboxylate O atoms of two chelating acetate groups and two O atoms of the coordinating water molecules. The organic hydrazine ligand is disordered over two orientations with a refined occupancy ratio of 0.52 (3):0.48 (3). All bond lengths in the coordination environment of the Tb3+ ion are slightly larger than those observed in the isostructural Y3+ and Er3+ complexes. In the crystal, the complex cations are linked by pairs of O—H...O hydrogen bonds into dimers. These dimers, nitrate anions and non-coordinating water molecules are joined by O—H...O and N—H...O hydrogen bonds into a three-dimensional structure.

Syntheses, Characterization, and X-ray Crystal Structure of Binuclear Lanthanide Complexes Assembled with Schiff Base and Acetate

“…The Pr•••Pr distance is 4.2777 (6) Å. All the bond lengths are normal and fall within similar ranges to those reported for dinuclear lanthanide complexes with the same hydrazone ligand[22,23].…”

“…Several authors [20,21] have used ligand analogous to 1-(pyridin-2-yl)-2-(pyridin-2-ylmethylene)hydrazine (HL) in the presence of acetate ions to prepare coordination compounds. Our group has already used this ligand in the presence of sodium acetate and hydrated lanthanide nitrate to prepare several complexes [22][23][24][25]. In all these complexes the acetate group is either bidentate chelating η 2 -OOCH 3 or bidentate bridging η 2 :µ 2 -OOCH 3 .…”

Synthesis, Spectroscopic and X-Ray Structure Determination of a New Mononuclear Terbium (III) Complex from the Ligand N,N'-1,5-bis(pyridylmethylidene) Carbonohydrazone (H2L)

“…The Tb-N(imine) [2.544(2)Å and 2.558(2)Å] are shorter the those of Tb-N(pyridine) [2.568(3)Å and 2.570(3)Å]. The same relations between the Tb-N(imine) and Tb-N(Py) bond lengths were observed in the structures of [TbL(NO [31]. Tb-O(carbonyl) [2.387(2) Å and 2.378( 2)Å] and Tb-OW distances involving oxygen atoms of coordinating water molecules of 2.378(2)Å, 2.411(3)Å and 2.400(2)Å are comparable with the values reported for similar complexes [36,37].…”

“…The coordination polyhedron is best described as a distorted monocapped square antiprism (Figure 2). The Tb-N distances vary from 2.544(2) Å to 2.570(3) Å, which fall in the range of those usually encountered for similar Schiff base nine coordinated Tb(III) complex [31][32][33]. The Tb-N(imine) [2.544(2)Å and 2.558(2)Å] are shorter the those of Tb-N(pyridine) [2.568(3)Å and 2.570(3)Å].…”

Tripyridinophane Platform Containing Three Acetate Pendant Arms: An Attractive Structural Entry for the Development of Neutral Eu(III) and Tb(III) Complexes in Aqueous Solution

“…Interestingly, [Gd-N-ac 3 [18]­aneN 3 O 3 ] 0 is a 9-coordinated complex where the Gd 3+ ion is surrounded by ligand donor groups with no coordinated inner-sphere water molecule. In [Tb-tpptac­(H 2 O)] 0 , the coordinated water oxygen is 2.385 Å from the terbium cation, and this value is comparable with the Ln–OH 2 distance reported in the [Dy-tpptacm] 3+ complex and in other polyaminopolycarboxylate terbium complexes. , …”