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Ion Exchange and Intersalation Reactions of Hectorite with Tris-Bipyridyl Metal Complexes

Published online by Cambridge University Press:  01 July 2024

Mary Frances Traynor F.S.E. ,
M. M. Mortland  and
T. J. Pinnavaia
Mary Frances Traynor F.S.E.
Affiliation:
Departments of Crop and Soil Science and Chemistry, Michigan State University, East Lansing, Michigan 48823
M. M. Mortland
Affiliation:
Departments of Crop and Soil Science and Chemistry, Michigan State University, East Lansing, Michigan 48823
T. J. Pinnavaia
Affiliation:
Departments of Crop and Soil Science and Chemistry, Michigan State University, East Lansing, Michigan 48823
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Abstract

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The binding of tris-bipyridyl metal complexes of the type M(bp)32+ (M = Fe2+, Cu2+, Ru2+) to hectorite surfaces is shown to occur by two mechanisms. (1) replacement of Na+ ions in the native mineral by cation exchange up to its cation exchange capacity and (2) intersalation of excess salt beyond the exchange capacity. In the cation exchange mechanism, the binding of metal complex is strongly favored over Na+. The intersalation reactions are dependent on the nature of the counter-anion: SO42-, Br- > CIO4−, Cl−. The homoionic M(bp)32+-hectorites, which exhibit rational 18 Å X-ray reflections, have been characterized with regard to their BET surface areas, water adsorption isotherms, types of water present, selected reactions in the intercalated state, and orientation of the complex ions in the interlayer regions. Mixed Fe(bp)32+, Na+-hectorites have also been examined and the results suggest segregation of the two ions between interlayers or within interlayers. Solid state intersalated phases have been isolated with 18 Å and 29.5 Å spacings. In general, surface areas of the intersalated phases are low, but the 18 Å phase derived from [Fe(bp)3]SO4 adsorption shows a high surface area, which even exceeds the surface area of homoionic Fe(bp)32+-hectorite.

Резюме

Резюме

Показано,что связывание трех-бипиридилового металлического комплекса типа M(bp)32+(M=Fe2+,Cu2+,Ru2+)c поверхностями гекторита происходит двумя путями: 1)замещением ионов Na+ в естественном минерале в результате катионного обмена до его возможного предела 2)внедрением избыточной соли за возможный предел обмена. При катионном обмене связывание металлического комплекса значительно сильнее,чем Na+. Реакции внедрения соли зависят от природы противо-аниона: SO42−, Br− > ClO4−, Cl−. Гомоионные M(bp)32+-гекториты, которым присущи рациональные отражения рентгеновских лучей 18Å,характеризуются в соответствии с их поверхностными зонами,определенными методом BET,изотермами адсорбции воды,типами присутствующей воды,избранными реакциями в интеркалированном состоянии,ориентацией сложных ионов в промежутках между слоями. Были исследованы также смешанные Fe(bp)32+,Na+-гeктopиты и установлено,что кулонное связывание сложного катиона предпочитается в промежутках между слоями с наибольшей плотностью заряда. Были изолированы интерсолированные фазы в твердом состоянии с промежутками 18Å и 29.5Å. В целом,поверхностные зоны интерсалированных фаз являются низкими,но фаза 18а,полученная в результате адсорбции [Fe(bp)3]SO4, доказывает более значительную поверхностную зону по сравнению с поверхностной зоной гомоион-ного Fe(bp)32+-гекторита.

Kurzreferat

Kurzreferat

Die Bindung von tris-bipyridyl Metallkomplexen vom Typ M(bp)32+(M= Fe2+, Cu2+, Ru2+) an Hektoritoberflächen befolgt zwei Mechanismen:(1) Auswechslung von Na+ Kationen im natürlichen Mineral durch Kationenaustausch bis zu seiner Kationenaustauschkapazität un. (2) Intersalation von über-schügBigem Salz über die Austauschkapazität hinaus. In dem Kationenaustausch-mechanismus wird die Bindung von Metallkomplexen dem Natrium vorgezogen. Die Intersalationsreaktionen hängen von der Natur der Anionen ab: SO42−, Br− > ClO4−, Cl−. Die homoionischen M(bp)32+ Hektoriten, die rationale 18 Å Röntgen-reflektionen besitzen, wurden durch ihre BET-Flächen, Wasseradsorptionsisothermen, Arten von Wasser anwesend und durch ausgewählte Reaktionen im ein-gelagerten Zustand und Orientierung von komplexen Ionen in den Zwischen-schichtgebieten, charakterisiert. Gemischte Fe(bp)23+ Na- Hektoriten wurden auch untersucht und die Resultate zeigen,dagB coulombische Bindung von komplexen Kationen in Zwischenschichten mit der höchsten Ladungsdichte bevorzugt ist. Feste,intersalierte Phasen mit 18 Å und 29,5 Å Abständen sind isoliert worden. Im allgemeinen sind die Flächen der intersalierten Phasen klein aber die 18 Å Phase, die von der [Fe(bp)3] SO4 Adsorption herstammt, zeigt eine Fläche, die über die Fläche von homoionischem Fe(bp)32+ - Hektorit hinausgeht.

Résumé

Résumé

La liaison de complexes métalliques de tris-bipyridyl du type M(bp)32+ (M=Fe2+,Cu2+,Ru2+) à des surfaces d'hectorite se passe par l'intermédiaire de 2 mécanismes:(1) remplacement par échange de cations des ions Na+ d'un minéral jusqu’à sa capacité d’échange de cations e. (2) intersalation du sel en excès au-delà de la capacité d’échange de cations. Dans le mécanisme d’échange de cations, la liaison du complexe métallique se passe préferentiellement aux dépens de Na+. Les réactions d'intersalation dépendent de la nature du contre-anion: SO42−, Br− > ClO4−, Cl-. Les hectorites homoioniques M(bp)32+,qui montrent des réflexions rationelles de rayons-X de 18 Å,ont été caractérisées quant à leurs aires de surface BET, les isothermes d'adsorption,les types d'eau présents, les réactions sélectionées dans l’état intercalé, et l'orientation des ions complexes dans les régions interfeuillet. Des hectorites mélangées Fe(bp)32+ Na+ ont aussi été examinées et les résultats suggèrent la ségrégation des 2 ions entre les couches interfeuillet ou au sein même des couches interfeullet. Des phases intersalées à l’état solide ont été isolées avec des périodicités de 18 A à 29.5 Å. En général, les aires de surface des phases interslées sont petites, mais la phase 18 A dérivée de l'adsorption [Fe(bp)3]SO4 montre une large aire de surface, plus grande même que celle de l'hectorite homoionique: Fe(bp)32+.

Keywords

BipyridylExchangeHectoriteIntersalationTris-bipyridyl
Type
Research Article
Information
Clays and Clay Minerals , Volume 26 , Issue 5 , October 1978 , pp. 318 - 326
Copyright
Copyright © 1978, The Clay Minerals Society

Footnotes

*

Journal Article No. 8450 Michigan Agricultural Experiment Station. This work was partially supported by National Science Foundation grant No. CHE76-80370-A01.

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