Synthesis, spectroscopic, thermal and XRD studies of aminoguanidinium copper and cadmium oxalates: Crystal structure of the copper complex

Rajendran Selvakumar; Steven J. Geib; Thathan Premkumar; Subbiah Govindarajan

doi:10.1007/s10973-015-5136-5

Synthesis, spectroscopic, thermal and XRD studies of aminoguanidinium copper and cadmium oxalates: Crystal structure of the copper complex

Rajendran Selvakumar
, Steven J. Geib
, Thathan Premkumar
, Subbiah Govindarajan

University College

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

New aminoguanidinium metal oxalate complexes with the formulae (AmgH)₂[Cu(C₂O₄)₂] and (AmgH)₂[Cd(C₂O₄)₂(H₂O)₂] have been synthesized and characterized. The copper compound loses aminoguanidine exothermically at 240°C in DTA, whereas aminoguanidine is lost endothermically at 200°C in cadmium. Both cases decompose exothermically via their respective metal oxalate intermediates to give metal oxide as the end product. It was also observed that hydrazine is lost exothermically in the hydrazinium copper oxalate hydrate. The single-crystal X-ray diffraction study of the copper complex revealed that aminoguanidinium ions are not involved in coordination but act as charge-compensating cations. It is interesting to note that both oxalates act as bidentate chelating ligands. One oxalate bridges the neighbouring copper atom through its carbonyl oxygen with a bond length of 2.561 Å to form square pyramidal geometry around the copper atom.

Original language	English
Pages (from-to)	375-385
Number of pages	11
Journal	Journal of Thermal Analysis and Calorimetry
Volume	124
Issue number	1
DOIs	https://doi.org/10.1007/s10973-015-5136-5
State	Published - 1 Apr 2016

Keywords

Chemical synthesis
Crystal structure
Inorganic compounds
X-ray diffraction

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@article{a3d212093b484207b09ed5b423bbdeae,

title = "Synthesis, spectroscopic, thermal and XRD studies of aminoguanidinium copper and cadmium oxalates: Crystal structure of the copper complex",

abstract = "New aminoguanidinium metal oxalate complexes with the formulae (AmgH)2[Cu(C2O4)2] and (AmgH)2[Cd(C2O4)2(H2O)2] have been synthesized and characterized. The copper compound loses aminoguanidine exothermically at 240°C in DTA, whereas aminoguanidine is lost endothermically at 200°C in cadmium. Both cases decompose exothermically via their respective metal oxalate intermediates to give metal oxide as the end product. It was also observed that hydrazine is lost exothermically in the hydrazinium copper oxalate hydrate. The single-crystal X-ray diffraction study of the copper complex revealed that aminoguanidinium ions are not involved in coordination but act as charge-compensating cations. It is interesting to note that both oxalates act as bidentate chelating ligands. One oxalate bridges the neighbouring copper atom through its carbonyl oxygen with a bond length of 2.561 {\AA} to form square pyramidal geometry around the copper atom.",

keywords = "Chemical synthesis, Crystal structure, Inorganic compounds, X-ray diffraction",

author = "Rajendran Selvakumar and Geib, \{Steven J.\} and Thathan Premkumar and Subbiah Govindarajan",

note = "Publisher Copyright: {\textcopyright} 2015 Akad{\'e}miai Kiad{\'o}, Budapest, Hungary.",

year = "2016",

month = apr,

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doi = "10.1007/s10973-015-5136-5",

language = "English",

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T1 - Synthesis, spectroscopic, thermal and XRD studies of aminoguanidinium copper and cadmium oxalates

T2 - Crystal structure of the copper complex

AU - Selvakumar, Rajendran

AU - Geib, Steven J.

AU - Premkumar, Thathan

AU - Govindarajan, Subbiah

PY - 2016/4/1

Y1 - 2016/4/1

N2 - New aminoguanidinium metal oxalate complexes with the formulae (AmgH)2[Cu(C2O4)2] and (AmgH)2[Cd(C2O4)2(H2O)2] have been synthesized and characterized. The copper compound loses aminoguanidine exothermically at 240°C in DTA, whereas aminoguanidine is lost endothermically at 200°C in cadmium. Both cases decompose exothermically via their respective metal oxalate intermediates to give metal oxide as the end product. It was also observed that hydrazine is lost exothermically in the hydrazinium copper oxalate hydrate. The single-crystal X-ray diffraction study of the copper complex revealed that aminoguanidinium ions are not involved in coordination but act as charge-compensating cations. It is interesting to note that both oxalates act as bidentate chelating ligands. One oxalate bridges the neighbouring copper atom through its carbonyl oxygen with a bond length of 2.561 Å to form square pyramidal geometry around the copper atom.

AB - New aminoguanidinium metal oxalate complexes with the formulae (AmgH)2[Cu(C2O4)2] and (AmgH)2[Cd(C2O4)2(H2O)2] have been synthesized and characterized. The copper compound loses aminoguanidine exothermically at 240°C in DTA, whereas aminoguanidine is lost endothermically at 200°C in cadmium. Both cases decompose exothermically via their respective metal oxalate intermediates to give metal oxide as the end product. It was also observed that hydrazine is lost exothermically in the hydrazinium copper oxalate hydrate. The single-crystal X-ray diffraction study of the copper complex revealed that aminoguanidinium ions are not involved in coordination but act as charge-compensating cations. It is interesting to note that both oxalates act as bidentate chelating ligands. One oxalate bridges the neighbouring copper atom through its carbonyl oxygen with a bond length of 2.561 Å to form square pyramidal geometry around the copper atom.

KW - Chemical synthesis

KW - Crystal structure

KW - Inorganic compounds

KW - X-ray diffraction

UR - https://www.scopus.com/pages/publications/84962621629

U2 - 10.1007/s10973-015-5136-5

DO - 10.1007/s10973-015-5136-5

M3 - Article

AN - SCOPUS:84962621629

SN - 1388-6150

VL - 124

SP - 375

EP - 385

JO - Journal of Thermal Analysis and Calorimetry

JF - Journal of Thermal Analysis and Calorimetry

IS - 1

ER -

Synthesis, spectroscopic, thermal and XRD studies of aminoguanidinium copper and cadmium oxalates: Crystal structure of the copper complex

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