Preparation, Structure and Properties of [Tb(HIA)2(IA)(H2O)2(HgCl2)]n(nHgCl4)·3nH2O (IA = Isonicotinate Anion)

• Published in: Journal of chemical crystallography Vol. 51; no. 1; pp. 116 - 123
• Main Author: Chen, Wen-Tong
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-03-2021; Springer Nature B.V
• Subjects: Anions; Chemistry; Chemistry and Materials Science; Chromaticity; Coordination compounds; Crystal structure; Crystallography and Scattering Methods; Energy levels; Energy transfer; Inorganic Chemistry; Mercury compounds; Organometallic Chemistry; Original Paper; Photoluminescence; Physical Chemistry; Solid state; Terbium; Mercury; Hydrothermal reaction; CIE; Photoluminescence
• ISSN: 1074-1542; 1572-8854
• DOI: 10.1007/s10870-020-00821-w

A novel 4f-5d compound [Tb(HIA)
2
(IA)(H
2
O)
2
(HgCl
2
)]
n
(
n
HgCl
4
)·3
n
H
2
O (1, IA = isonicotinate anion) has been prepared and structurally determined by X-ray diffraction. Complex 1 crystallizes in the
P
2
1
/
c
space group of the monoclinic system with
a
 = 9.6875(3),
b
 = 19.8318(7),
c
 = 17.0899(5) Å,
β
 = 101.609(3)º,
V
 = 3216.16(18) Å
3
, C
18
H
24
Cl
6
Hg
2
N
3
O
11
Tb,
M
r
 = 1231.20,
Z
 = 4,
D
c
 = 2.543 g/cm
3
,
μ
(Mo
Kα
) = 12.251 mm
–1
and
F
(000) = 2272. The crystal structure of complex 1 is characterized by a two-dimensional (2-
D
) layer-like structure. The photoluminescence measurements with solid-state samples reveal that it exhibits a yellowish green emission with the emission bands locating at 490, 546, 586 and 620 nm, respectively. The photoluminescence emission bands are resulted from the characteristic emission of the 4
f
electrons intrashell transition of the
5
D
4
 → 
7
F
J
(
J
 = 6, 5, 4, 3) of the Tb
3+
ion. The energy transfer mechanism is explained by using the energy level diagram of the Tb
3+
ion and isonicotinic acid ligand. Complex 1 exhibits CIE chromaticity coordinates being of 0.3823 and 0.5141. A solid-state diffuse reflectance measurement shows that the complex possesses a wide optical band gap of 2.67 eV.
Graphic Abstract
A novel 4f-5d compound featuring a 2-D layer-like structure has been reported for the crystal structure and properties.