A variety of metal–organic and supramolecular networks constructed from a new flexible multifunctional building block bearing picolinate and terephthalate functionalities: hydrothermal self-assembly, structural features, magnetic and luminescent properties
A novel flexible multifunctional building block (H 3 L) bearing picolinate and terephthalate functionalities was designed and applied for the hydrothermal self-assembly generation of a series of coordination compounds [Co(H 2 L) 2 (H 2 O) 2 ] ( 1 ), [M(HL)(H 2 O)] n {M = Cd ( 2 ) and Mn ( 3 )}, {[Mn...
Saved in:
| Published in | RSC advances Vol. 5; no. 106; pp. 87484 - 87495 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
01.01.2015
|
| Subjects | |
| Online Access | Get full text |
Cover
Loading…
| Summary: | A novel flexible multifunctional building block (H
3
L) bearing picolinate and terephthalate functionalities was designed and applied for the hydrothermal self-assembly generation of a series of coordination compounds [Co(H
2
L)
2
(H
2
O)
2
] (
1
), [M(HL)(H
2
O)]
n
{M = Cd (
2
) and Mn (
3
)}, {[Mn
1.5
(L)(phen)(H
2
O)
2
]·H
2
O}
n
(
4
), [Zn
3
(L)
2
(H
2
O)
6
]
n
(
5
), and {[Zn
3
(L)
2
(py) (H
2
O)
4
]·4H
2
O}
n
(
6
) {wherein H
3
L = 2-(4-carboxypyridin-3-yl)-terephthalic acid, phen = 1,10-phenanthroline, py = pyridine}. All the obtained products
1–6
were fully characterized by IR spectroscopy, elemental, thermogravimetric, powder and single-crystal X-ray diffraction analyses. By adjusting the molar ratio of NaOH and H
3
L ligand, the latter becomes partially deprotonated to form the H
2
L
−
blocks in
1
and HL
2−
moieties in
2
and
3
, or completely deprotonated to create the L
3−
units in
4–6
. The structures of the obtained compounds range from a discrete 0D monomer
1
and 1D coordination polymers
4
and
5
to 2D coordination polymers
2
and
3
, and an intricate 3D metal–organic framework
6
; their detailed topological classification was also performed. The structures of
1–5
are further extended [0D → 3D (
1
), 1D → 3D (
4
,
5
), and 2D → 3D (
2
,
3
)] into supramolecular networks by means of multiple hydrogen bonds. The results reveal that the nature of metal(
ii
) ion, molar ratio between NaOH and H
3
L ligand, and the presence (optional) of auxiliary ligand play a significant role in determining dimensionality, topology and other structural features of the obtained products. Magnetic susceptibility measurements indicate that compounds
3
and
4
have dominating antiferromagnetic couplings between metal centers. Furthermore, luminescent properties of
2
,
5
, and
6
were also investigated. |
|---|---|
| Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 2046-2069 2046-2069 |
| DOI: | 10.1039/C5RA16580F |