CRYSTAL STRUCTURES AND CHARACTERIZATION OF TWO ONE–DIMENSIONAL COORDINATION POLYMERS CONTAINING Ln3+ IONS AND ANTHRANILATE (C7H6NO2)– ANIONS
S. Hussain1, I.U. Khan1, W.T.A. Harrison2, M.N. Tahir3, S. Ahmad4
1Government College University, Lahore, 54000, Pakistan 2University of Aberdeen, Aberdeen AB24 3UE, Scotland 3University of Sargodha, Sargodha, Pakistan 4University of Engineering and Technology, Lahore, Pakistan
Keywords: cerium, praseodymium, anthranilate anion, synthesis, crystal structure, one dimensional coordination polymer
Abstract
The syntheses, crystal structures and characterization (IR, TGA/DSC) of the isostructural one-dimensional coordination polymers [Ce(C
7H
6NO
2)
3]
n (
1) and [Pr(C
7H
6NO
2)
3]
n (
2) are described. The metal ions adopt distorted capped square anti-prismatic MO
9 coordination geometries. The anthranilate ligands bridge the metal ions in bridging-bidentate (O, μ
2-O') mode to generate [010] chains in the crystal and each ligand features an intramolecular N-H⋯O hydrogen bond. It is notable that two very similar, but crystallographically distinct chains appear in the unit cell. Crystal data:
1, C
21H
18CeN
3O
6,
M
r = 548.51, monoclinic,
P2
1/
c (No. 14),
a = 25.0476(10) Å,
b = 7.4924(2) Å,
c = 24.6366(7) Å, β = 119.424(1)°,
V = 4027.1(2) Å
3,
R(
F) = 0.037,
wR(
F
2) = 0.068. 2, C
21H
18N
3O
6Pr,
M
r = 549.29, monoclinic,
P2
1/
c (No. 14),
a = 25.0077(13) Å,
b = 7.4497(3) Å,
c = 24.6063(12) Å, β = 119.392(2)°,
V = 3994.1(3) Å
3,
R(
F) = 0.031,
wR(
F
2) = 0.068.
DOI: 10.1134/S0022476615010187
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