TY - JOUR
T1 - On the dissolution of gold in K2Qx and Na2Qx fluxes (Q=S, Se). Formation of KAuS5, KAuSe5, CsAuSe3, KAuSe2 and NaAuSe2
T2 - Low-dimensional Au+ and Au3+ compounds with poly- and mono-chalcogenide ligands
AU - Park, Younbong
AU - Kanatzidis, Mercouri G.
N1 - Funding Information:
Financial support from the National Science Foundation DMR-9527347 is gratefully acknowledged. MGK is an A.E Sloan Foundation, and a Camille and Henry Dreyfus Teacher Scholar 1993-1998. This work made use of the SEM facilities of the Center for Electron Optics at Michigan State University. Supporting information available: Tables of fractional atomic coordinates of all atoms,
PY - 1997/7/25
Y1 - 1997/7/25
N2 - Five compounds of gold, KAuS5, KAuSe5, CsAuSe3, KAuSe2 and NaAuSe2 are reported. Their preparation was accomplished by dissolving gold in molten alkali polychalcogenide salts in the temperature range of 250-350°C. KAuS5 and KAuSe5 crystallize in the space group Ibam with a=8.310(2) Å, b=10.758(3) Å, c=15.468(4) Å, V=1383 Å3, and a=8.625(6) Å, b=11.293(9) Å, c=16.425(11) Å, V=1600 Å3, respectively. CsAuSe3, crystallizes in the space group C2/c with a=6.483(3) Å, b=13.789(5) Å, c=7.651(3) Å, β=112.17(3)°, V=633 Å3. KAuSe2 crystallizes in the space group P4/mbm with a=b=7.699(3) Å, c=3.665(1) Å, V=217 Å3. Finally NaAuSe2 crystallizes in the space group P21/c with a=6.991(8) Å, b=8.374(9) Å, c=6.724(8) Å, β=105.23(9)°, V=379.8 Å3. KAuS5 and KAuSe5 have one-dimensional infinite [AuQ5]- chains with linear Au+ atoms connected with Q2-5 ligands. There are close Au-Au interactions between the chains. CsAuSe3 has a similar one-dimensional structure but the [AuSe3]- chains are helical and there are no Au-Au interactions between the chains. KAuSe2 and NaAuSe2 are Au3+ compounds where the gold atoms are in square planar geometry. The K+ salt has infinite ribbons of [AuSe2]- but the Na salt has corrugated layers of [AuSe2]-. Spectroscopic characterization of the compounds is reported.
AB - Five compounds of gold, KAuS5, KAuSe5, CsAuSe3, KAuSe2 and NaAuSe2 are reported. Their preparation was accomplished by dissolving gold in molten alkali polychalcogenide salts in the temperature range of 250-350°C. KAuS5 and KAuSe5 crystallize in the space group Ibam with a=8.310(2) Å, b=10.758(3) Å, c=15.468(4) Å, V=1383 Å3, and a=8.625(6) Å, b=11.293(9) Å, c=16.425(11) Å, V=1600 Å3, respectively. CsAuSe3, crystallizes in the space group C2/c with a=6.483(3) Å, b=13.789(5) Å, c=7.651(3) Å, β=112.17(3)°, V=633 Å3. KAuSe2 crystallizes in the space group P4/mbm with a=b=7.699(3) Å, c=3.665(1) Å, V=217 Å3. Finally NaAuSe2 crystallizes in the space group P21/c with a=6.991(8) Å, b=8.374(9) Å, c=6.724(8) Å, β=105.23(9)°, V=379.8 Å3. KAuS5 and KAuSe5 have one-dimensional infinite [AuQ5]- chains with linear Au+ atoms connected with Q2-5 ligands. There are close Au-Au interactions between the chains. CsAuSe3 has a similar one-dimensional structure but the [AuSe3]- chains are helical and there are no Au-Au interactions between the chains. KAuSe2 and NaAuSe2 are Au3+ compounds where the gold atoms are in square planar geometry. The K+ salt has infinite ribbons of [AuSe2]- but the Na salt has corrugated layers of [AuSe2]-. Spectroscopic characterization of the compounds is reported.
KW - CsAuSe
KW - Dissolution of gold
KW - KAuS
KW - KAuSe
KW - KAuSe
KW - NaAuSe
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U2 - 10.1016/S0925-8388(96)03130-1
DO - 10.1016/S0925-8388(96)03130-1
M3 - Article
AN - SCOPUS:0031175935
SN - 0925-8388
VL - 257
SP - 137
EP - 145
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -