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Atom Exchange Versus Reconstruction: (Ge x As 4− x ) x − ( x= 2, 3) as Building Blocks for the Supertetrahedral Zintl Cluster [Au 6 (Ge 3 As)(Ge 2 As 2 ) 3 ] 3−
Author(s) -
Pan Fuxing,
Guggolz Lukas,
Weigend Florian,
Dehnen Stefanie
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202008108
Subject(s) - isostructural , crystallography , octahedron , chemistry , atom (system on chip) , cluster (spacecraft) , ternary operation , ion , group (periodic table) , crystal structure , organic chemistry , computer science , programming language , embedded system
Abstract The Zintl anion (Ge 2 As 2 ) 2− represents an isostructural and isoelectronic binary counterpart of yellow arsenic, yet without being studied with the same intensity so far. Upon introducing [(PPh 3 )AuMe] into the 1,2‐diaminoethane (en) solution of (Ge 2 As 2 ) 2− , the heterometallic cluster anion [Au 6 (Ge 3 As)(Ge 2 As 2 ) 3 ] 3− is obtained as its salt [K(crypt‐222)] 3 [Au 6 (Ge 3 As)(Ge 2 As 2 ) 3 ]⋅en⋅2 tol ( 1 ). The anion represents a rare example of a superpolyhedral Zintl cluster, and it comprises the largest number of Au atoms relative to main group (semi)metal atoms in such clusters. The overall supertetrahedral structure is based on a (non‐bonding) octahedron of six Au atoms that is face‐capped by four (Ge x As 4− x ) x − ( x =2, 3) units. The Au atoms bind to four main group atoms in a rectangular manner, and this way hold the four units together to form this unprecedented architecture. The presence of one (Ge 3 As) 3− unit besides three (Ge 2 As 2 ) 2− units as a consequence of an exchange reaction in solution was verified by detailed quantum chemical (DFT) calculations, which ruled out all other compositions besides [Au 6 (Ge 3 As)(Ge 2 As 2 ) 3 ] 3− . Reactions of the heavier homologues (Tt 2 Pn 2 ) 2− (Tt=Sn, Pb; Pn=Sb, Bi) did not yield clusters corresponding to that in 1 , but dimers of ternary nine‐vertex clusters, {[AuTt 5 Pn 3 ] 2 } 4− (in 2 – 4 ; Tt/Pn=Sn/Sb, Sn/Bi, Pb/Sb), since the underlying pseudo ‐tetrahedral units comprising heavier atoms do not tend to undergo the said exchange reactions as readily as (Ge 2 As 2 ) 2− , according to the DFT calculations.