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2005
Phosphorus group
I 0062
Liberation of Pnicogen Chains from Cu2P1.8As1.2 I2: Synthesis and Characterizaof a New Allotrope of P—As. — Removal of CuI from Cu 2P1.8As1.2I2 by stirring
01- 021 tion
in aq. KCN solution results in a novel P—As allotrope. Although the product is X-ray
amorphous, lattice fringes are observed in the transmission electron micrographs with
spacings reflecting the diameter of the linear pnicogen polymer in Cu2P1.8As1.2I2, suggesting that the pnicogen chains remain intact upon loss of CuI. The straight needles
present in Cu2P1.8As1.2 I2 appear to be kinked in the P—As phase due to lattice mismatch
between the liberated polymers, ultrasonic treatment, or a combination of these effects.
This new P—As modification is semiconducting with a band gap of 1.05 eV. —
(JAYASEKERA, B.; SOMASKANDAN, K.; BROCK*, S. L.; Inorg. Chem. 43
(2004) 22, 6902-6904; Dep. Chem., Wayne State Univ., Detroit, MI 48202, USA;
Eng.) — Schramke
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