Reaction of the partially dehydrated cobalt(II)-exchanged zeolite A (Co-A) with ethylenediamine (en) at 130 C in an autoclave yields after 24 h a product (Coen-A) in which entire Co(II) content (tetrahedrally coordinated in the partially dehydrated Co-A) is present in the form of the Co(en)3(2+) ions. Steric factors require the Co(en)3(2+) ions to be substituted only in the larger cages of zeolite A (alfa-cages), implying that the conversion of Co-A into Coen-A is accompanied by a migration of Co2+ ions initially located in the smaller cages (beta-cages) into alfa-cages. The Co/en molar ratio in Coen-A is 1:5.6, so that a fraction of en is also present in a noncoordinated form. IR spectral data suggest that the coordinated en adopts to the gauche conformation. TG analysis shows that the thermal decomposition of Coen-A occurs in four steps, such that water is lost first, followed by the loss of en.
TY - JOUR
AU - Rajić, Nevenka Z.
AU - Stojaković, Djordje R.
PY - 1994
UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6396
AB - Reaction of the partially dehydrated cobalt(II)-exchanged zeolite A (Co-A) with ethylenediamine (en) at 130 C in an autoclave yields after 24 h a product (Coen-A) in which entire Co(II) content (tetrahedrally coordinated in the partially dehydrated Co-A) is present in the form of the Co(en)3(2+) ions. Steric factors require the Co(en)3(2+) ions to be substituted only in the larger cages of zeolite A (alfa-cages), implying that the conversion of Co-A into Coen-A is accompanied by a migration of Co2+ ions initially located in the smaller cages (beta-cages) into alfa-cages. The Co/en molar ratio in Coen-A is 1:5.6, so that a fraction of en is also present in a noncoordinated form. IR spectral data suggest that the coordinated en adopts to the gauche conformation. TG analysis shows that the thermal decomposition of Coen-A occurs in four steps, such that water is lost first, followed by the loss of en.
PB - Slovenian Chemical Society
T2 - Acta Chimica Slovenica
T1 - A cobalt(II) complex with ethylenediamine inside zeolite A
EP - 304
IS - 3
SP - 295
VL - 41
UR - https://hdl.handle.net/21.15107/rcub_technorep_6396
ER -
@article{
author = "Rajić, Nevenka Z. and Stojaković, Djordje R.",
year = "1994",
abstract = "Reaction of the partially dehydrated cobalt(II)-exchanged zeolite A (Co-A) with ethylenediamine (en) at 130 C in an autoclave yields after 24 h a product (Coen-A) in which entire Co(II) content (tetrahedrally coordinated in the partially dehydrated Co-A) is present in the form of the Co(en)3(2+) ions. Steric factors require the Co(en)3(2+) ions to be substituted only in the larger cages of zeolite A (alfa-cages), implying that the conversion of Co-A into Coen-A is accompanied by a migration of Co2+ ions initially located in the smaller cages (beta-cages) into alfa-cages. The Co/en molar ratio in Coen-A is 1:5.6, so that a fraction of en is also present in a noncoordinated form. IR spectral data suggest that the coordinated en adopts to the gauche conformation. TG analysis shows that the thermal decomposition of Coen-A occurs in four steps, such that water is lost first, followed by the loss of en.",
publisher = "Slovenian Chemical Society",
journal = "Acta Chimica Slovenica",
title = "A cobalt(II) complex with ethylenediamine inside zeolite A",
pages = "304-295",
number = "3",
volume = "41",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6396"
}
Rajić, N. Z.,& Stojaković, D. R.. (1994). A cobalt(II) complex with ethylenediamine inside zeolite A. in Acta Chimica Slovenica
Slovenian Chemical Society., 41(3), 295-304.
https://hdl.handle.net/21.15107/rcub_technorep_6396
Rajić NZ, Stojaković DR. A cobalt(II) complex with ethylenediamine inside zeolite A. in Acta Chimica Slovenica. 1994;41(3):295-304.
https://hdl.handle.net/21.15107/rcub_technorep_6396 .
Rajić, Nevenka Z., Stojaković, Djordje R., "A cobalt(II) complex with ethylenediamine inside zeolite A" in Acta Chimica Slovenica, 41, no. 3 (1994):295-304,
https://hdl.handle.net/21.15107/rcub_technorep_6396 .
