In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Soluble Zintl Phases A14ZnGe16 (A = K, Rb) Featuring [(η3-Ge4)Zn(η2-Ge4)]6- and [Ge4]4- Clusters and the Isolation of [(MesCu)2(η3,η3-Ge4)]4-: The Missing Link in the Solution Chemistry of Tetrahedral Group 14 Element Zintl Clusters, published in 2012-09-05, which mentions a compound: 75732-01-3, Name is Mesitylcopper(I), Molecular C9H11Cu, Application of 75732-01-3.
The number of Zintl phases containing polyhedral clusters of tetrel elements that are accessible for chem. reactions of the main-group element clusters is rather limited. The synthesis and structural characterization of two novel ternary intermetallic phases A14ZnGe16 (A = K, Rb) are presented, and their chem. reactivity was studied. The compounds can be rationalized as Zintl phases with 14 alkali metal cations A+ (A = K, Rb), two tetrahedral [Ge4]4- Zintl anions, and one anionic heterometallic [(Ge4)Zn(Ge4)]6- cluster per formula unit. The Zn-Ge cluster comprises two (Ge4) tetrahedra linked by a Zn atom, with one (Ge4) tetrahedron coordinating with a triangular face (η3) and the other one with an edge (η2). [(η3-Ge4)Zn(η2-Ge4)]6- is a new isomer of the [(Ge4)Zn(Ge4)]6- anion in Cs6ZnGe8. The phases dissolve in liquid NH3 and thus represent rare examples of soluble Zintl compounds with deltahedral units of Group 14 element atoms. Compounds with tetrahedral [E4]4- species were previously isolated from solution for E = Si, Sn, and Pb, and the current study provides the missing link for E = Ge. Reaction of an NH3 solution of K14ZnGe16 with MesCu (Mes = 2,4,6-Me3C6H2) in the presence of [18]-crown-6 (1,4,7,10,13,16-hexaoxacyclooctadecane) yielded crystals of [K([18]-crown-6)]2K2[(MesCu)2Ge4](NH3)7.5 with the polyanion [(MesCu)2Ge4]4-. This MesCu-stabilized tetrahedral [Ge4]4- cluster also completes [(MesCu)2Si4-xGex]4- clusters, which were previously isolated from solution for x = 0 and 0.7, as the end member with x = 4. The electronic structures of [(Ge4)Zn(Ge4)]6- and [(MesCu)2Ge4]4- were studied in terms of a MO description and analyses of the electron localization functions. The results are compared with band structure calculations for the A14ZnGe16 phases (A = K, Rb).
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Reference:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com