Syntheses, crystal structures, and optical properties of K{sub 3}V{sub 0.32}Ta{sub 0.68}S{sub 4}, K{sub 6}Nb{sub 1.07}Ta{sub 2.93}S{sub 22}, K{sub 6}Nb{sub 2.97}Ta{sub 1.03}S{sub 25}, K{sub 3}Cu{sub 3}Nb{sub 0.98}Ta{sub 1.02}S{sub 8}, and KCu{sub 2}Nb{sub 0.53}Ta{sub 0.47}S{sub 4}

Journal Article · Sun Jul 15 04:00:00 EDT 2007 · Journal of Solid State Chemistry

OSTI ID:21015888

Yuandong, Wu ^[1]; Bensch, Wolfgang ^[1]

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1. Institut fuer Anorganische Chemie, Universitaet Kiel, Olshausenstr. 40, D-24098 Kiel (Germany)

The new compounds K{sub 3}V{sub 0.32}Ta{sub 0.68}S{sub 4} (1), K{sub 6}Nb{sub 1.07}Ta{sub 2.93}S{sub 22} (2), K{sub 6}Nb{sub 2.97}Ta{sub 1.03}S{sub 25} (3), K{sub 3}Cu{sub 3}Nb{sub 0.98}Ta{sub 1.02}S{sub 8} (4), and KCu{sub 2}Nb{sub 0.53}Ta{sub 0.47}S{sub 4} (5) have been synthesized by the reactive flux method. Their crystal structures were determined by single crystal X-ray diffraction. Crystal data: 1: space group Pnma, a=9.2354(7), b=10.6920(6), c=9.2991(5) A, Z=4; 2: space group P2{sub 1}/c, a=7.6412(4), b=8.7572(5), c=24.5772(14) A, {beta}=98.559(6){sup o}, Z=2; 3: space group P2{sub 1}/n, a=15.7147(10), b=12.9840(9), c=18.2363(12) A, {beta}=104.123(8){sup o}, Z=4; 4: space group C2/c, a=23.5934(19), b=5.5661(2), c=14.2373(12) A, {beta}=120.631(9){sup o}, Z=4; 5: space group Ama2, a=7.4615(4), b=18.2902(16), c=5.5320(6) A, Z=4. The structure of compound 1 is based on discrete tetrahedral MS{sub 4} (M=V/Ta) anions, which are separated by K{sup +} cations. The structure of 2 consists of K{sup +} cations and [M {sub 4}S{sub 22}]{sup 6-} (M=Nb/Ta) anions, in which two M {sub 2}S{sub 11} building blocks are linked via terminal sulfur ligands. In 3 the complex anion [M {sub 4}S{sub 25}]{sup 6-} (M=Nb/Ta) is observed which comprises two M {sub 2}S{sub 11} subunits bridged by a S{sub 3} chain. In 4 {sup 1} {sub {infinity}}[Cu{sub 3} M {sub 2}S{sub 8}]{sup 3-} (M=Nb/Ta) anionic chains are found which are formed by corner sharing of CuS{sub 4} tetrahedra and edge sharing between CuS{sub 4} and MS{sub 4} tetrahedra. The structure of 5 consists of [Cu{sub 2} MS{sub 4}]{sup -} (M=Nb/Ta) anionic layers separated by K{sup +} cations. The CuS{sub 4} and MS{sub 4} tetrahedra share edges and corners yielding layers. All compounds were characterized with Raman spectroscopy and the compound 2-5 with UV/vis diffuse reflectance spectroscopy. - Graphical abstract: The five compounds K{sub 3}V{sub 0.32}Ta{sub 0.68}S{sub 4}, K{sub 6}Nb{sub 1.07}Ta{sub 2.93}S{sub 22}, K{sub 6}Nb{sub 2.97}Ta{sub 1.03}S{sub 25}, K{sub 3}Cu{sub 3}Nb{sub 0.98}Ta{sub 1.02}S{sub 8}, and KCu{sub 2}Nb{sub 0.53}Ta{sub 0.47}S{sub 4} have been prepared in polychalcogenide melts. The structures of these compounds base on discrete tetrahedra [MS{sub 4}]{sup 3-} (M=V/Ta), complex [M {sub 4}S{sub 22}]{sup 6-} and [M {sub 4}S{sub 25}]{sup 6-} anions comprised of two M {sub 2}S{sub 11} subunits bridged by a S{sub 2} or S{sub 3} chain, {sup 1} {sub {infinity}}[Cu{sub 3} M {sub 2}S{sub 8}]{sup 3-} anionic chains, and {sup 2} {sub {infinity}}[Cu{sub 2} MS{sub 4}]{sup -} (M=Nb/Ta) anionic layers formed by corner sharing and edge sharing between CuS{sub 4} and MS{sub 4} tetrahedra.

• OSTI ID: 21015888
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 7 Vol. 180; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
COPPER COMPOUNDS
FLUX SYNTHESIS
LAYERS
MONOCLINIC LATTICES
MONOCRYSTALS
NIOBIUM COMPOUNDS
OPTICAL PROPERTIES
ORTHORHOMBIC LATTICES
POTASSIUM COMPOUNDS
POTASSIUM IONS
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SPACE GROUPS
SULFIDES
SYNTHESIS
TANTALUM COMPOUNDS
X-RAY DIFFRACTION