Cobalt(III) dicarboxylato bis-ethylenediamine nitrates: Preparation and characterization by thermal analysis and other analytical methods |
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Authors: | U Biader Ceipidor R Bucci V Carunchio A M Girelli A D Magri |
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Institution: | (1) Dipartimento di Chimica, Universitá la Sapienza , Piazz. le Aldo Moro 5, 00185 Roma, Italy;(2) Istituto di Chimica, Universitá Della Basilicata, Via Nazario Sauro 85, 85100 Potenza, Italy |
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Abstract: | Compounds with the general formulacis ortrans-Coen
2 (RCOO)2]NO3 were prepared by modifications of known procedures; R was H, CH3, C2H5 or C3H7, anden was ethylenediamine. The compounds were characterized by TLC and UV-Vis spectrophotometry, and their thermal behaviour was examined via TG and DTA, and via IR spectra on heated samples.The thermal stabilities are discussed in terms of the strengths of the bonds in the solids 1] and steric hindrance; the thermal decompositions are described with the aid of hypothesized intermediates and IR spectra.Reaction steps are identified and the thermal stability sequence is discussed: thecis compounds are less stable than the correspondingtrans compounds, due to the lower reticulation effect; the sequence of thecis compounds is the reverse of the sequence of carboxylate ion basicity, while the sequence displalyed by thetrans compounds can be interpreted in terms of solid lattice stabilization.
Zusammenfassung Unter Durchführung einiger Abänderungen des bekannten Verfahrens wurden Verbindungen der allgemeinen Formel conf-Coen2(RCOO)2]NO3 hergestellt. Der AlkylrestR war H, CH3, C2H5, C3H7 unden war Ethylendiamin. Die Verbidungen mitconf=cis odertrans wurden mittels TLC und UV-Spektrophotometrie charakterisiert. Ihr thermisches Verhalten wurdeanhand von TG, DTA und IR-Spektren von erhitzten Proben untersucht. Die thermische Stabilität wurde untersucht und in Abhängigkeit von Bindungsstärke und sterischer Behinderung diskutirt; weiterhin wurden die thermischen Zersetzungen mit Hilfe angenommener Intermediäre und deren IR-Spektren beschrieben. Die Reaktionsschritte wurden identifiziert und eine Stabilitätsreihe aufgestellt und diskutiert: cis-Verbindungen erwiesen sich als instabiler als die entsprechenden trans-Verbindungen, was einem geringeren Vernetzungseffekt zuzuschreiben ist; Die Reihenfolge folgt im Falle voncis dem Reziproken der Carboxylationenbasizität, während die Reihenfolge im Falle vontrans mittels der Gitterstabilisierung erklärt werden kann.
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![ncy](/content/jw11154530133627/xxlarge1085.gif) ![icy](/content/jw11154530133627/xxlarge1080.gif) ![ecy](/content/jw11154530133627/xxlarge1101.gif) ![tcy](/content/jw11154530133627/xxlarge1090.gif) ![pcy](/content/jw11154530133627/xxlarge1087.gif) ![ocy](/content/jw11154530133627/xxlarge1086.gif) ![rcy](/content/jw11154530133627/xxlarge1088.gif) ![yacy](/content/jw11154530133627/xxlarge1103.gif) ![dcy](/content/jw11154530133627/xxlarge1076.gif) ![ocy](/content/jw11154530133627/xxlarge1086.gif) ![mcy](/content/jw11154530133627/xxlarge1084.gif) ![ocy](/content/jw11154530133627/xxlarge1086.gif) ![zhcy](/content/jw11154530133627/xxlarge1078.gif) ![iecy](/content/jw11154530133627/xxlarge1077.gif) ![bcy](/content/jw11154530133627/xxlarge1073.gif) ![ycy](/content/jw11154530133627/xxlarge1099.gif) ![tcy](/content/jw11154530133627/xxlarge1090.gif) ![ocy](/content/jw11154530133627/xxlarge1086.gif) ![bcy](/content/jw11154530133627/xxlarge1073.gif) ![hardcy](/content/jw11154530133627/xxlarge1098.gif) ![yacy](/content/jw11154530133627/xxlarge1103.gif) ![scy](/content/jw11154530133627/xxlarge1089.gif) ![ncy](/content/jw11154530133627/xxlarge1085.gif) ![iecy](/content/jw11154530133627/xxlarge1077.gif) ![ncy](/content/jw11154530133627/xxlarge1085.gif) ![ocy](/content/jw11154530133627/xxlarge1086.gif) ![scy](/content/jw11154530133627/xxlarge1089.gif) ![ncy](/content/jw11154530133627/xxlarge1085.gif) ![ocy](/content/jw11154530133627/xxlarge1086.gif) ![vcy](/content/jw11154530133627/xxlarge1074.gif) ![ucy](/content/jw11154530133627/xxlarge1091.gif) ![tcy](/content/jw11154530133627/xxlarge1090.gif) ![ocy](/content/jw11154530133627/xxlarge1086.gif) ![jcy](/content/jw11154530133627/xxlarge1081.gif) ![chcy](/content/jw11154530133627/xxlarge1095.gif) ![icy](/content/jw11154530133627/xxlarge1080.gif) ![vcy](/content/jw11154530133627/xxlarge1074.gif) ![ocy](/content/jw11154530133627/xxlarge1086.gif) ![scy](/content/jw11154530133627/xxlarge1089.gif) ![tcy](/content/jw11154530133627/xxlarge1090.gif) ![tcy](/content/jw11154530133627/xxlarge1090.gif) ![vcy](/content/jw11154530133627/xxlarge1074.gif) ![iecy](/content/jw11154530133627/xxlarge1077.gif) ![rcy](/content/jw11154530133627/xxlarge1088.gif) ![dcy](/content/jw11154530133627/xxlarge1076.gif) ![ocy](/content/jw11154530133627/xxlarge1086.gif) ![tcy](/content/jw11154530133627/xxlarge1090.gif) ![lcy](/content/jw11154530133627/xxlarge1083.gif) ![softcy](/content/jw11154530133627/xxlarge1100.gif) ![ncy](/content/jw11154530133627/xxlarge1085.gif) ![ocy](/content/jw11154530133627/xxlarge1086.gif) ![rcy](/content/jw11154530133627/xxlarge1088.gif) ![iecy](/content/jw11154530133627/xxlarge1077.gif) ![shcy](/content/jw11154530133627/xxlarge1096.gif) ![iecy](/content/jw11154530133627/xxlarge1077.gif) ![tcy](/content/jw11154530133627/xxlarge1090.gif) ![kcy](/content/jw11154530133627/xxlarge1082.gif) .
This work was carried out with the financial support of the Consiglio Nazionale delle Ricerche (C.N.R.), which also gave a grant to one of us (A.M.G.). |
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