title: Distribution of trivalent metal cations in alumino-/gallogermanate zeolites with JST topology.
abstract: A series of zeolitic alumino- and gallogermanate compounds, |M(II)(en)(3)|[M(III)(2)Ge(4)O(12)] (M(II) = Ni, Co, Zn; M(III) = Al, Ga; en = ethylenediamine), has been synthesized using in situ formed [M(II)(en)(3)](2+) cations as the structure-directing agents. These zeolitic compounds exhibit the same JST framework topology which is built exclusively of 3-rings. Their structures were determined by single-crystal X-ray diffraction. The frameworks of these compounds are constructed from M(III)- and Ge-centred tetrahedra. According to inductively coupled plasma (ICP) analyses, the ratios of M(III)/Ge are 1/2 in all these compounds. The resulting negative charges in these frameworks are compensated by extra-framework [M(II)(en)(3)](2+) cations. Single crystal structural analyses show that there are two crystallographically distinct atom sites for M(3+). According to the ICP results and the unique structural feature of JST, the most reasonable distribution of M(3+) cations in these structures was deduced.
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, PR China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
authors.forename: Yide
authors.initials: Y
authors.lastname: Han
authors.forename: Jihong
authors.initials: J
authors.lastname: Yu
authors.forename: Ruren
authors.initials: R
authors.lastname: Xu