NDLI: Group 12 metal complexes of (2-piperazine-1-yl-ethyl)-pyridin-2-yl-methylene-amine: rare participation of terminal piperazine N in coordination leads to structural diversity

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Group 12 metal complexes of (2-piperazine-1-yl-ethyl)-pyridin-2-yl-methylene-amine: rare participation of terminal piperazine N in coordination leads to structural diversity

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Dalton Transactions Vol - 46 Issue - 6

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Group 12 metal complexes of (2-piperazine-1-yl-ethyl)-pyridin-2-yl-methylene-amine: rare participation of terminal piperazine N in coordination leads to structural diversity

Content Provider	Royal Society of Chemistry (RSC)
Author	Aullón, Gabriel Zangrando, Ennio Chakraborty, Prateeti Purkait, Suranjana
Copyright Year	2017
Abstract	By using a potential tridentate ligand L ((2-piperazine-1-yl-ethyl)-pyridin-2-yl-methylene-amine), a series of group 12 metal complexes namely, [ZnLHCl2][Zn2LCl5]·2H2O (1), [CdL(SCN)2(CH3OH)]n (2), and [Hg(L-pyCO)Cl2] (3), were synthesized and structurally characterized. In all the complexes the piperazine nitrogen of the ligand takes part in coordination and leads to the complexes of group 12 metal ions having structural diversity. The X-ray diffraction analysis of complex 1 indicates for one Zn(II) ion a geometry in between trigonal bipyramidal/square pyramidal and for the second a distorted tetrahedral sphere. In the polymeric complex 2 the Cd(II) ion shows a distorted octahedral environment, while in the mononuclear complex 3, where Hg(II) exhibits a square-pyramidal geometry, an unexpected condensation between the uncoordinated NH piperazine fragment with 2-pyridinecarboxaldehyde was detected. The M–N bond lengths in all the complexes are in accordance with the metal ionic radius. Continuous shape measures through a DFT approach provide the coordination environment around each metal centre that is comparable with the experimental observations. We have also investigated the importance of hydrogen bonding of methanol in the generation of the polymeric Cd complex 2 along with the rearrangement of the tridentate ligand to generate an octahedral complex. The photoluminescence properties of the complexes as well as of the ligand were investigated in solution at ambient temperature. The low quantum yield of the ligand was ascribed due to a very fast photoinduced electron transfer (PET) from the nitrogen lone pair to the conjugated pyridine moiety. Complexation prevents the electron transfer, and consequently an increase in quantum yield was observed in the complexes. Among the three complexes the highest photoluminescence was exhibited by a Zn complex, being lower in Cd and Hg complexes as a consequence of the heavy atom perturbation effect.
Starting Page	2184
Ending Page	2195
Page Count	12
File Format	HTM / HTML PDF
ISSN	14779226
Volume Number	46
Issue Number	7
Journal	Dalton Transactions
DOI	10.1039/c6dt04578b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Ligand Piperazine Group 12 element La Compagnie des Lampes Nitrogen X-ray crystallography Ion Molecular geometry Trigonal bipyramidal molecular geometry Chemical bond Ionic radius Hydrogen bond Methanol Photoluminescence Quantum mechanics Photoinduced electron transfer Positron emission tomography Lone pair Pyridine
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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Group 12 metal complexes of (2-piperazine-1-yl-ethyl)-pyridin-2-yl-methylene-amine: rare participation of terminal piperazine N in coordination leads to structural diversity

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Group 12 metal complexes of (2-piperazine-1-yl-ethyl)-pyridin-2-yl-methylene-amine: rare participation of terminal piperazine N in coordination leads to structural diversity