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Na5 [CN2]2 [CN], (Li,Na) 5 [CN2]2 [CN], and K2 [CN2]: Carbodiimides from high-pressure synthesis

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dc.contributor.author Zhang S. en
dc.contributor.author Zherebtsov D.A. en
dc.contributor.author DiSalvo F.J. en
dc.contributor.author Niewa R. en
dc.date.accessioned 2018-10-15T11:17:21Z
dc.date.available 2018-10-15T11:17:21Z
dc.date.issued 2012
dc.identifier.issn 442313
dc.identifier.uri http://dspace.susu.ru/handle/0001.74/19991
dc.description.abstract The first alkali metal carbodiimide cyanides Na5 [CN 2]2 [CN] and (Li,Na) 5 [CN2] 2 [CN] were obtained from reaction of carbon with nitrogen gas pressure of 7 MPa in sodium melts without or with admixture of Li3N, respectively. The crystal structures were refined from single-crystal X-ray diffraction (Na5[CN2]2[CN]: a = 7.201(2) Å, c = 6.605(4) Å, I4/mmm, R1 = 0.028, wR2 = 0.079; (Li1.40Na3.60(3))5[CN2]2[CN]: a = 7.0034(3) Å, Im3̄m, R1 = 0.038, wR2 = 0.084). Whereas in Na5[CN2]2[CN] a fully ordered arrangement of the anions is realized, in (Li,Na)5 [CN 2]2 [CN] both the alkali metal cations and the anions are disordered, with some site preference of lithium and sodium, leading to an increase of space group symmetry from I4/mmm for the pure sodium compound to Im3̄m for the mixed Li/Na phase. Ammonothermal synthesis at 90 MPa leads to crystal growth of carbodiimide K2 [CN2] (a = 5.762(1) Å, b = 5.669(1) Å, c = 5.756(1) Å, β = 108.78(3)°, C2/m) crystals in the cold zone of an autoclave. The crystal structure was analyzed and compared to the carbodiimide cyanides. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. en]
dc.language.iso English
dc.relation.ispartof Zeitschrift fur Anorganische und Allgemeine Chemie en]
dc.title Na5 [CN2]2 [CN], (Li,Na) 5 [CN2]2 [CN], and K2 [CN2]: Carbodiimides from high-pressure synthesis en
dc.type Article en]
dc.identifier.doi 10.1002/zaac.201100413
dc.identifier.scopus https://www.scopus.com/inward/record.uri?eid=2-s2.0-84870507188&doi=10.1002%2fzaac.201100413&partnerID=40&md5=a46e1f0a91ff9232c20e3691f7c07595

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