TY - JOUR
T1 - Cluster self-assembly of di[gold(I)]halonium cations
AU - Schmidbaur, Hubert
AU - Hamel, Armin
AU - Mitzel, Norbert W.
AU - Schier, Annette
AU - Nogai, Stefan
PY - 2002/4/16
Y1 - 2002/4/16
N2 - Treatment of gold(I) halide complexes of the type L-Au-X [where L = PPh3, PEt3 with X = Cl, Br, I, or L = 2,6-(MeO)2C6H3PPh2 with X = Cl] with AgSbF6 in the molar ratio 2:1 in dichloromethane/tetrahydrofuran at -78°C affords high yields of di[gold(I)]halonium salts of the formula {(X[Au(PR3)]2}+ SbF6 - (2-8). A determination of the crystal structures of the four triarylphosphine complexes (2-4, 8) revealed the presence of novel tetranuclear dications with a highly symmetrical structure (point group S4) that arises from self-assembly of the dinuclear monocations through a set of four equivalent aurophilic Au-Au interactions. A comparison with two reference structures of corresponding chloronium perchlorate and bromonium tetrafluoroborate salts with monomeric, dinuclear cations shows that the geometry of the latter is greatly altered on dimerization to optimize the interactions between the closed-shell metal centers (Au: 5d10). Weak metallophilic bonding clearly becomes significant only in crystal lattices where anions with a larger ionic radius (SbF6 - vs. BF4 -, ClO4 -) reduce the otherwise dominant role of strong interionic Coulomb forces. The results indicate that aurophilic bonding is indeed an ubiquitous, quite dependable mode of intermetallic interactions provided that the right environment is chosen to allow the weak forces to become operative.
AB - Treatment of gold(I) halide complexes of the type L-Au-X [where L = PPh3, PEt3 with X = Cl, Br, I, or L = 2,6-(MeO)2C6H3PPh2 with X = Cl] with AgSbF6 in the molar ratio 2:1 in dichloromethane/tetrahydrofuran at -78°C affords high yields of di[gold(I)]halonium salts of the formula {(X[Au(PR3)]2}+ SbF6 - (2-8). A determination of the crystal structures of the four triarylphosphine complexes (2-4, 8) revealed the presence of novel tetranuclear dications with a highly symmetrical structure (point group S4) that arises from self-assembly of the dinuclear monocations through a set of four equivalent aurophilic Au-Au interactions. A comparison with two reference structures of corresponding chloronium perchlorate and bromonium tetrafluoroborate salts with monomeric, dinuclear cations shows that the geometry of the latter is greatly altered on dimerization to optimize the interactions between the closed-shell metal centers (Au: 5d10). Weak metallophilic bonding clearly becomes significant only in crystal lattices where anions with a larger ionic radius (SbF6 - vs. BF4 -, ClO4 -) reduce the otherwise dominant role of strong interionic Coulomb forces. The results indicate that aurophilic bonding is indeed an ubiquitous, quite dependable mode of intermetallic interactions provided that the right environment is chosen to allow the weak forces to become operative.
UR - http://www.scopus.com/inward/record.url?scp=0037117566&partnerID=8YFLogxK
U2 - 10.1073/pnas.062643599
DO - 10.1073/pnas.062643599
M3 - Article
C2 - 11959944
AN - SCOPUS:0037117566
SN - 0027-8424
VL - 99
SP - 4916
EP - 4921
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 8
ER -