Zinc(II) Complexes with Asymmetric 3,5-Substituted 1H-Pyrazoles
(2012) In European Journal of Inorganic Chemistry p.1639-1649- Abstract
- Two new pyrazolate-based ligands, N'-[1-(3-acetyl-4-methyl-1H-pyrazol-5-yl)ethylidene]-2-(hydroxyimino)propanehydrazide (L1) and 5-[(E)-1-(2-{(E)-2-(hydroxyimino}propanoyl}hydrazono)ethyl]-4-methyl-1H-pyrazole-3-carboxylic acid (L2), were synthesized and studied for zinc(II) complexation. A set of pH-dependent UV/Vis measurements has been performed to determine the complex formation properties of L2. According to the calculations, in solution, L2 forms variously protonated mononuclear (ZnII/L2 = 1:1) and dinuclear (ZnII/L2 = 2:1) complexes. The reaction of the deprotonated ligands with hydrated ZnII salts and slow diffusion of ammonia into the reaction mixtures gave mononuclear [Zn(L1-2H)(NH3)2]center dot DMF (1) and trinuclear... (More)
- Two new pyrazolate-based ligands, N'-[1-(3-acetyl-4-methyl-1H-pyrazol-5-yl)ethylidene]-2-(hydroxyimino)propanehydrazide (L1) and 5-[(E)-1-(2-{(E)-2-(hydroxyimino}propanoyl}hydrazono)ethyl]-4-methyl-1H-pyrazole-3-carboxylic acid (L2), were synthesized and studied for zinc(II) complexation. A set of pH-dependent UV/Vis measurements has been performed to determine the complex formation properties of L2. According to the calculations, in solution, L2 forms variously protonated mononuclear (ZnII/L2 = 1:1) and dinuclear (ZnII/L2 = 2:1) complexes. The reaction of the deprotonated ligands with hydrated ZnII salts and slow diffusion of ammonia into the reaction mixtures gave mononuclear [Zn(L1-2H)(NH3)2]center dot DMF (1) and trinuclear mu-pyrazolato-bridged [Zn3(L2-3H)2(NH3)5]center dot 4H2O (3). In both complexes, the zinc ions are in the same distorted trigonal-bipyramidal environment, coordinated to two nitrogen atoms of the ammonia and one oxygen and two nitrogen atoms of the pyrazolate and hydrazide groups. The molecular structures of all of the ligands and complexes have been elucidated by X-ray crystallography. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2574833
- author
- Malinkin, Sergey O. ; Penkova, Larysa ; Moroz, Yurii S. ; Haukka, Matti ; Maciag, Anna ; Gumienna-Kontecka, Elzbieta ; Pavlenko, Vadim A. ; Pavlova, Svetlana ; Nordlander, Ebbe LU and Fritsky, Igor O.
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- N, O ligands, Zinc, Structure elucidation
- in
- European Journal of Inorganic Chemistry
- issue
- 10
- pages
- 1639 - 1649
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- wos:000301986600009
- scopus:84859094557
- ISSN
- 1099-0682
- DOI
- 10.1002/ejic.201101090
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
- id
- 94e966de-5e12-4687-8fe5-41164538880d (old id 2574833)
- date added to LUP
- 2016-04-01 10:22:06
- date last changed
- 2022-01-25 22:35:31
@article{94e966de-5e12-4687-8fe5-41164538880d,
abstract = {{Two new pyrazolate-based ligands, N'-[1-(3-acetyl-4-methyl-1H-pyrazol-5-yl)ethylidene]-2-(hydroxyimino)propanehydrazide (L1) and 5-[(E)-1-(2-{(E)-2-(hydroxyimino}propanoyl}hydrazono)ethyl]-4-methyl-1H-pyrazole-3-carboxylic acid (L2), were synthesized and studied for zinc(II) complexation. A set of pH-dependent UV/Vis measurements has been performed to determine the complex formation properties of L2. According to the calculations, in solution, L2 forms variously protonated mononuclear (ZnII/L2 = 1:1) and dinuclear (ZnII/L2 = 2:1) complexes. The reaction of the deprotonated ligands with hydrated ZnII salts and slow diffusion of ammonia into the reaction mixtures gave mononuclear [Zn(L1-2H)(NH3)2]center dot DMF (1) and trinuclear mu-pyrazolato-bridged [Zn3(L2-3H)2(NH3)5]center dot 4H2O (3). In both complexes, the zinc ions are in the same distorted trigonal-bipyramidal environment, coordinated to two nitrogen atoms of the ammonia and one oxygen and two nitrogen atoms of the pyrazolate and hydrazide groups. The molecular structures of all of the ligands and complexes have been elucidated by X-ray crystallography.}},
author = {{Malinkin, Sergey O. and Penkova, Larysa and Moroz, Yurii S. and Haukka, Matti and Maciag, Anna and Gumienna-Kontecka, Elzbieta and Pavlenko, Vadim A. and Pavlova, Svetlana and Nordlander, Ebbe and Fritsky, Igor O.}},
issn = {{1099-0682}},
keywords = {{N; O ligands; Zinc; Structure elucidation}},
language = {{eng}},
number = {{10}},
pages = {{1639--1649}},
publisher = {{John Wiley & Sons Inc.}},
series = {{European Journal of Inorganic Chemistry}},
title = {{Zinc(II) Complexes with Asymmetric 3,5-Substituted 1H-Pyrazoles}},
url = {{http://dx.doi.org/10.1002/ejic.201101090}},
doi = {{10.1002/ejic.201101090}},
year = {{2012}},
}