Comparative study on MnII, NiII and CuII supramolecular complexes obtained from a proton transfer methodology: solid- and solution-state studies
In this study, the solution chemistry and solid-state structures of a novel proton transfer compound, (pipzH 2 )(pyc) 2 ·H 2 O 1 , and three metal–organic complexes of [Mn(pyc) 2 (H 2 O) 2 ] 2 ·2H 2 O 2 , [Ni(pyc) 2 (H 2 O) 2 ]·H 2 O 3 and [Cu(pyc) 2 H 2 O] n 4 , (pyc = pyridine-2-carboxylate, pipz ...
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| Published in: | Journal of the Iranian Chemical Society Vol. 10; no. 4; pp. 817 - 829 |
|---|---|
| Main Authors: | , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Berlin/Heidelberg
Springer-Verlag
01-08-2013
|
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | In this study, the solution chemistry and solid-state structures of a novel proton transfer compound, (pipzH
2
)(pyc)
2
·H
2
O
1
, and three metal–organic complexes of [Mn(pyc)
2
(H
2
O)
2
]
2
·2H
2
O
2
, [Ni(pyc)
2
(H
2
O)
2
]·H
2
O
3
and [Cu(pyc)
2
H
2
O]
n
4
, (pyc = pyridine-2-carboxylate, pipz = piperazine) were investigated. On the basis of crystallographic data, each M
II
ion is coordinated to pyridine-2-carboxylate as bidentate ligand. Furthermore, these complexes form a three-dimensional structure by a variety of noncovalent interactions such as extensive O–H···O, O–H···N, N–H···O, N–H···N, C–H···O hydrogen bonds, C–H···π and C–O···π interactions. The equilibrium constants for the binary pyc-pipz proton transfer system, the stoichiometry and stability of complexation of this system with Mn
2+
, Ni
2+
and Cu
2+
ions in aqueous solution were investigated by potentiometric pH titration method. In each case, the stoichiometry of the dominant metal complex species in solution was compared with that obtained from the crystal structure.
Graphical abstract |
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| ISSN: | 1735-207X 1735-2428 |
| DOI: | 10.1007/s13738-012-0217-x |