CRYSTAL STRUCTURES AND CHARACTERIZATION OF TWO RARE-EARTH-GLUTARATE COORDINATION NETWORKS: ONE-DIMENSIONAL [Nd(C5H6O4)(H2O)4]·Cl AND THREE-DIMENSIONAL [Pr(C5H6O4)(C5H7O4)(H2O)]·H2O
S. Hussain1, I.U. Khan1, W.T.A. Harrison2, M.N. Tahir3
1Government College University, Lahore, Pakistan
2University of Aberdeen, Aberdeen, Scotland
3University of Sargodha, Sargodha, Pakistan
Keywords: synthesis, crystal structure, coordination polymer, neodymium, praseodymium
Abstract
The synthesis, crystal structures, and characterization (IR, TGA/DSC) of [Nd(C
5H
6O
4)·(H
2O)
4]·Cl (1) and Pr(C
5H
6O
4)(C
5H
7O
4)(H
2O)]·H
2O (2) are described. Compound 1 is a one-dimensional coordination polymer containing double chains incorporating pairs of edge-sharing NdO
9 polyhedra linked by glutarate dianions. A network of O-H⋯O and O-H⋯Cl hydrogen bonds helps to consolidate the structure. Compound 2 is a three-dimensional coordination polymer incorporating chains of edge-sharing PrO
10 polyhedra. Its glutarate ion adopts an extended conformation, whereas its hydrogen glutarate ion takes on a twisted conformation. O-H⋯O hydrogen bonds are seen in the crystal structure, which features small channels occupied by water molecules. Crystal data: 1, C
5H
14ClNdO
8, M
r = 381.85, monoclinic,
P 2
1/
c (No. 14),
a = 8.9763(6) Å,
b = 15.9277(11) Å,
c = 8.8690(6) Å, β = 112.090(2)°,
V = 1174.94(14) Å
3,
Z = 4,
R (
F ) = 0.016,
wR (
F
2) = 0.037. 2, C
10H
17O
10Pr,
M
r = 438.15, orthorhombic,
Pbca (No. 61),
a = 16.3030(7) Å,
b = 8.6714(4) Å,
c = 19.3899(8) Å,
V = 2741.1(2) Å
3,
Z = 8,
R (
F ) = 0.020,
wR (
F
2) = 0.050.
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