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A Study of the Interactions in an Extended Unsupported Gold‐Silver Chain
Author(s) -
Fernández Eduardo J.,
Laguna Antonio,
LópezdeLuzuriaga José M.,
Monge Miguel,
Pyykkö Pekka,
Runeberg Nino
Publication year - 2002
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200203)2002:3<750::aid-ejic750>3.0.co;2-2
Subject(s) - chemistry , pyridine , stacking , crystallography , intermetallic , ion , dispersion (optics) , ionic bonding , computational chemistry , chemical physics , organic chemistry , physics , alloy , optics
The complex [Ag(Py) 3 ][Au(C 6 F 5 ) 2 ]·Py ( 1 ) (Py = pyridine) has been prepared by the reaction of NBu 4 [Au(C 6 F 5 ) 2 ] with AgClO 4 in the presence of pyridine. The crystallographic measurements indicate the presence of an extended unsupported one‐dimensional chain of alternating gold and silver atoms. This arrangement is due to the formation of molecular Au−Ag ion pairs, to the π‐stacking of C 6 F 5 and pyridine arene ligands and to the packing effects that lead to molecular ion pairs at short distance. Theoretical calculations based on approximate experimental distances and angles reveal the presence of both metallophilic Au I −Ag I and aromatic C 6 F 5 ‐pyridine interactions. From a theoretical point of view the nature of the intermetallic attraction arises from both an ionic contribution and from dispersion‐type correlation effects; the aromatic interaction is mainly due to dispersion‐type correlation effects.