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Three Inter‐Alkali Metal Acetylides: KNaC 2 , KRbC 2 , and NaRbC 2 : Syntheses, Crystal Structures, and Structural Systematics
Author(s) -
Liebig Stefan,
Billetter Heinrich,
Wallraff Tim,
Busch Stefanie,
Müller Stefan,
Ruschewitz Uwe
Publication year - 2016
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201500693
Subject(s) - alkali metal , crystallography , chemistry , crystal structure , structure type , molar ratio , metal , type (biology) , structural type , alkaline earth metal , x ray crystallography , stereochemistry , diffraction , physics , catalysis , organic chemistry , ecology , optics , biology
Three alkali metal acetylides, namely KNaC 2 , KRbC 2 , and NaRbC 2 , were synthesized and characterized by means of X‐ray powder diffraction. KNaC 2 and KRbC 2 crystallize as a variant of the anti ‐PbCl 2 ‐type structure ( Pnma , Z = 4), whereas NaRbC 2 crystallizes as a variant of the anti ‐PbFCl‐type structure ( Pmmn , Z = 2). Based on a simple systematic approach developed by Sabrowsky et al. for inter‐alkali metal chalcogenides all known inter‐alkali metal acetylides can be classified into two classes: variants of the anti ‐PbCl 2 type structure and variants of the anti ‐PbFCl type structure. Acetylides with Q (ABC 2 ) ≤ 1.45 crystallize in the anti ‐PbCl 2 ‐type structure, whereas for Q (ABC 2 ) > 1.45 the anti ‐PbFCl‐type structure is found ( Q ( AB C 2 ) = V m ( A 2 C 2 )/ V m ( B 2 C 2 ) with V m ( A 2 C 2 ) > V m ( B 2 C 2 ); V m : molar volume, A , B = alkali metals).