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Cation sites and ligand exchange on nickel(II) zeolite A

✍ Scribed by N.Z. Rajić; Dj.R. Stojaković

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
323 KB
Volume
8
Category
Article
ISSN
0144-2449

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✦ Synopsis

Treatment of the nickel(ll)-substituted zeolite A with 1, 2-diaminoethane (en), 1, 2-diaminopropane (pnd), and 1, 3-diaminopropane (trod) yields products (NiA-en, NiA-pnd, and Nia-tmd, respectively) distinguished by the presence of two kinds of Ni 2+ coordination sites. One site contains the Ni 2+ ion octahedrally coordinated only by O-atom donors. The other site has, for NiA-en and NiA-pnd, the octahedral environment around Ni 2+, the ion being bound to one diamine ligand; for NiA-tmd, there is a square planar Ni(tmd)2 2+ complex. A fraction of the diamine content is, in all cases, present in the system in cationic form.

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## Abstract Five new, bifunctional imidazolium–thioether ligands of the general formula RS(CH~2~)__~n~__(imidazolium)^+^ArBr^–^ (__n__ = 2 or 3, R = Et or __t__Bu, Ar = 2,4,6‐trimethylphenyl or 2,6‐diisopropylphenyl) have been synthesised in good overall yields by a general method and used as N‐het