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1.  Tris(ethyl­enediamine-κ2 N,N′)cadmium hexa­fluoridogermanate 
In the title compound, [Cd(C2H8N2)3](GeF6), the CdII atom, lying on a 32 symmetry site, is coordinated by six N atoms from three ethyl­enediamine (en) ligands in a distorted octa­hedral geometry. The Ge atom also lies on a 32 symmetry site and is coordinated by six F atoms. The en ligand has a twofold rotation axis passing through the mid-point of the C—C bond. The F atom is disordered over two sites with equal occupancy factors. In the crystal, the [Cd(en)3]2+ cations and [GeF6]2− anions are connected through N—H⋯F hydrogen bonds, forming a three-dimensional supra­molecular network.
doi:10.1107/S160053681200983X
PMCID: PMC3343808  PMID: 22589782
2.  catena-Poly[[cadmium-bis­(μ-triethyl­ene­tetra­mine-κ4 N,N′:N′′,N′′′)-cadmium-(μ-triethyl­ene­tetra­mine-κ4 N,N′:N′′,N′′′)] hexa­fluoridogermanate] 
The title fluoridogermanate, {[Cd2(C6H18N4)3][GeF6]}n, was synthesized hydro­thermally. The crystal structure comprises undulated cationic [Cd2(TETA)3]4+ chains (TETA is triethyl­ene­tetra­mine) propagating parallel to [101]. The central CdII atom is six-coordinated in a CdN6 set by three TETA ligands. The isolated [GeF6]2− units, serving as counter-anions, occupy the inter-chain spaces and simultaneously link adjacent chains into a three-dimensional network through extensive N—H⋯F hydrogen-bonding inter­actions. One of the ethyl­ene bridges of one TETA ligand is disordered around a twofold rotation axis.
doi:10.1107/S1600536811033381
PMCID: PMC3200897  PMID: 22058875
3.  Bis(ethyl­enediammonium) tetra­deca­borate 
The title compound, 2C2H10N2 2+·B14O20(OH)6 4−, consists of a centrosymmetric tetra­deca­borate anion and two ethyl­enediammonium cations. The anions are inter­connected through strong O—H⋯O hydrogen bonds into a three-dimensional supra­molecular network with channels along [100], [010], [001] and [111]. The diprotonated cations reside in the channels and inter­act with the inorganic framework by extensive N—H⋯O hydrogen bonds.
doi:10.1107/S1600536810008494
PMCID: PMC2983971  PMID: 21580636

Results 1-3 (3)