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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.
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.
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.
PMCID: PMC2983971  PMID: 21580636
4.  Poly[tetra­aqua-μ3-benzene-1,2-di­carboxyl­ato-μ3-bromido-penta-μ2-bromido-octa-μ3-isonicotinato-hepta­copper(I)trilanthanum(III)] 
A new lanthanum(III)–copper(I) heterometallic coordination polymer, [Cu7La3Br6(C6H4NO2)8(C8H4O4)(H2O)4]n, has been prepared by a hydro­thermal method. Of the three La atoms in the asymmetric unit, two are eight-coordinate with bicapped trigonal–prismatic configurations; the third is nine-coordinated and has a tricapped trigonal–prismatic coordination geometry. Of the seven Cu atoms, two are two-coordinate with CuBrN and CuN2 ligand sets, three have trigonal configurations, viz. CuBrN2, CuBr2N and CuBr3, while the remaining two adopt distorted tetra­hedral CuBr3N geometries. In the crystal structure, adjacent La centers are linked by isonicotinate (IN−) and benzene-1,2-dicarboxyl­ate ligands to form a two-dimensional La–carboxyl­ate layer in the ab plane. These layers are further inter­connected with each other by bridging [Cu(IN)2] motifs, leading to an unusual three-dimensional heterometallic Cu–halide–lanthanide–organic framework, with the inorganic [Cu6Br6]n chains located in the resulting channels. Two Cu atoms are disordered over two positions, both with site occupancy factors of 0.80 and 0.20. O—H⋯O hydrogen bonding between water molecules and carboxylate O atoms helps to consolidate the crystal packing.
PMCID: PMC2977598  PMID: 21583784
5.  Cyclo­hexyldimethyl­ammonium tetra­hydroxy­penta­borate 
The title compound, [C8H18N]+·[B5O6(OH)4]−, has been synthesized under mild solvothermal conditions in the presence of N,N-dimethyl­cyclo­hexyl­amine acting as a template. The structure consists of penta­borate [B5O6(OH)4]− anions connected through O—H⋯O hydrogen bonds into a three-dimensional framework, with large channels along [100], [010] and [001] directions. The [C8H18N]+ cations reside in the channels, inter­acting with the framework through N—H⋯O hydrogen bonds.
PMCID: PMC2959341  PMID: 21201021
6.  Poly[tetra­aqua-μ4-bromido-di-μ2-bromido-μ2-hydroxido-di-μ3-iso­nicotinato-tetra-μ2-isonicotinato-tetra­copper(I)dithulium(III)] 
A new thulium(III)–copper(I) heterometallic coordination polymer, [Cu4Tm2Br3(C6H4NO2)6(OH)(H2O)4]n, has been prepared by a hydro­thermal method. The Tm and both Cu atoms lie on mirror planes. The Tm atom is seven-coordinate with a capped distorted trigonal–prismatic coordination geometry, while the Cu atoms adopt trigonal CuBrN2 and tetra­hedral CuBr3N coordination modes, respectively. The Cu atom in the trigonal coordination environment is disordered over two sites of equal occupancy. The crystal structure is constructed from two distinct units of dimeric [Tm2(μ2-OH(IN)6(H2O)4] cores (IN = isonicotinate) and one-dimensional inorganic [Cu4Br3]n chains, which are linked together, forming heterometallic Cu–halide–lanthanide–organic layers.
PMCID: PMC2959303  PMID: 21201015
7.  Poly[diaqua­penta­kis(μ4-benzene-1,2-dicarboxyl­ato)(μ3-benzene-1,2-dicarboxyl­ato)tetra­thulium(III)] 
The title compound, [Tm4(C8H4O4)6(H2O)2]n, has been synthesized hydro­thermally. The asymmetric unit has four unique TmIII ions that are six-, seven-, eight- and nine-coordinate. The cations are inter­connected by bridging benzene-1,2-dicarboxyl­ate (BDC) anions to form an infinite two-dimensional framework, in which the BDC ligands adopt three different coordination modes. Adjacent sheets are further packed to form a three-dimensional supra­molecular framework through O—H⋯O hydrogen bonds.
PMCID: PMC2960755  PMID: 21201858

Results 1-7 (7)