Add time:07/22/2019         Source:sciencedirect.com

The title compound was prepared by reaction of the elements at 700°C in the presence of iodine. Its crystal structure— determined from single-crystal diffractometer data—is isotypic with that of β-V4As3: C2/m, a = 1341.1(2) pm, b = 369.34(5) pm, c = 962.8(1) pm, β = 101.97(1)°, and R = 0.027 for 1394 structure factors and 62 variable parameters. Mn4As3 is the member with n = 2 of a series of closely related structures with the general composition Mn2+nAs1+n. Other members of this series are the modification III of Mn3As2 (with n = 1) and the two closely related structures of MnAs (with n = ∞). The structural relationships of these compounds and the other known manganese arsenides Mn2As, Mn3As2(I), Mn3As2(II), and Mn5As4 are pointed out, emphasizing the numerous Mn — Mn bonds in these arsenides with high manganese content.

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