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- W2005849063 abstract "Reactions in superheated ethylenediamine (en) solutions at 160°C resulted in two novel quaternary intermetallic copper selenides, RbCu1.2Ag3.8Se3(I) and Cs2Cu2Sb2Se5(II). Both I and II are metal rich and represent new layered structure types. Compound I crystallizes in the tetragonal crystal system, space group P4/nbm (No. 125) with a=5.991(1) Å, c=10.918(2) Å, Z=2, V=391.9(1) Å3, R1/wR2=0.0373/0.0458 for all reflections. Compound II belongs to the triclinic crystal system, space group P1 (No. 2), a=7.645(1) Å, b=8.768(2) Å, c=10.264(1) Å, α=91.97(2)°, β=92.07(2)°, γ=103.05(1)°, Z=2, V=669.2(3) Å3, R1/wR2=0.0685/0.0740 for all reflections. I consists of 2∞[(Cu1.2Ag3.8Se3)−] layers and Rb+ counterions located between these layers. There are two types of metal-to-selenium coordination, a square planar (Ag) and a trigonal pyramidal (Cu/Ag). The Se(1) atom displays an unusual eight coordination with Ag and Cu. II contains alternating 2∞[(Cu2Sb2Se5)2−] anionic and Cs+ cationic layers. Each copper atom has a distorted tetrahedral coordination to four Se atoms, and each antimony atom bonds to three Se atoms to result in a trigonal pyramidal geometry. Both I and II are semiconductors with estimated band gaps of 0.7–0.8 and 1.2–1.3 eV, respectively." @default.
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- W2005849063 date "1970-01-01" @default.
- W2005849063 modified "2023-09-25" @default.
- W2005849063 title "Thermodynamics of ?-complex formation between 1,3-butadiene and Cu ion" @default.
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- W2005849063 doi "https://doi.org/10.1016/0031-6458(70)90068-7" @default.
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