TY - JOUR
T1 - Ligand and counterion control of Ag(I) architectures: Assembly of a {Ag-8} ring cluster mediated by hydrophobic and Ag center dot center dot center dot Ag interactions
AU - Fielden, John
AU - Long, De-liang
AU - Slawin, Alexandra M. Z.
AU - Kogerler, Paul
AU - Cronin, Leroy
PY - 2007/10/29
Y1 - 2007/10/29
N2 - A strategy combining ligand design and counterion variation has been used to investigate the assembly of silver(I) complexes. As a result, dinuclear, octanuclear, and polymeric silver(I) species have been synthesized by complexation of the rigid aliphatic amino ligands cis-3,5-diamino-trans-hydroxycyclohexane (DAHC), cis-3,5-diamino- transmethoxycyclohexane (DAMC), and cis-3,5-diamino-trans-tert-butyidimethylsilylanyloxycyclohexane (DATC) with silver(I) triflate, nitrate, and perchlorate. The compositions of these aggregates, established by X-ray crystallography and elemental analysis, are [fAg(DAHC)}(2)](CF3SO3)(2) (1), [{Ag(DAMC)}(2)](CF3SO3)(2) (2), [{Ag(DAMC)}(2)](NO3)(2) (3), [{Ag-(DATC)}(6){Ag(DAHC)}(2)](NO3)(8) (4), and [{Ag(DATC}(n)](NO3)(n) (5), where the DAHC present in 4 is formed by in situ hydrolysis of the acid labile silyl ether group. The type of aggregate formed depends both upon the noncoordinating O-substituent of the ligand and the (also noncoordinating) counterion, with the normal preference of the ligand topology for forming Ag2L2 structures being broken by introduction of the bulky, lipophilic O-tert-butyidimethylsilyl (TBDMS) group. Of particular note is the octanuclear silver ring structure 4, which is isolated only when both the O-TBDMS group and the nitrate counteranion are present and is formed from four Ag2L2 dimers; connected by Ag center dot center dot center dot Ag and hydrogen-bonding interactions. Diffusion rate measurement of this {Ag-8} complex by H-1 NMR (DOSY) indicates dissociation in CD3OD and CD3CN, showing that this supramolecular ring structure is formed upon crystallization, and establishing a qualitative limit to the strength of Ag center dot center dot center dot Ag interactions in solution. When solutions of the {Ag-8} cluster in methanol are kept for several days though, a new UV-vis absorption is observed at around 430 nm, consistent with the formation of silver nanoparticles.
AB - A strategy combining ligand design and counterion variation has been used to investigate the assembly of silver(I) complexes. As a result, dinuclear, octanuclear, and polymeric silver(I) species have been synthesized by complexation of the rigid aliphatic amino ligands cis-3,5-diamino-trans-hydroxycyclohexane (DAHC), cis-3,5-diamino- transmethoxycyclohexane (DAMC), and cis-3,5-diamino-trans-tert-butyidimethylsilylanyloxycyclohexane (DATC) with silver(I) triflate, nitrate, and perchlorate. The compositions of these aggregates, established by X-ray crystallography and elemental analysis, are [fAg(DAHC)}(2)](CF3SO3)(2) (1), [{Ag(DAMC)}(2)](CF3SO3)(2) (2), [{Ag(DAMC)}(2)](NO3)(2) (3), [{Ag-(DATC)}(6){Ag(DAHC)}(2)](NO3)(8) (4), and [{Ag(DATC}(n)](NO3)(n) (5), where the DAHC present in 4 is formed by in situ hydrolysis of the acid labile silyl ether group. The type of aggregate formed depends both upon the noncoordinating O-substituent of the ligand and the (also noncoordinating) counterion, with the normal preference of the ligand topology for forming Ag2L2 structures being broken by introduction of the bulky, lipophilic O-tert-butyidimethylsilyl (TBDMS) group. Of particular note is the octanuclear silver ring structure 4, which is isolated only when both the O-TBDMS group and the nitrate counteranion are present and is formed from four Ag2L2 dimers; connected by Ag center dot center dot center dot Ag and hydrogen-bonding interactions. Diffusion rate measurement of this {Ag-8} complex by H-1 NMR (DOSY) indicates dissociation in CD3OD and CD3CN, showing that this supramolecular ring structure is formed upon crystallization, and establishing a qualitative limit to the strength of Ag center dot center dot center dot Ag interactions in solution. When solutions of the {Ag-8} cluster in methanol are kept for several days though, a new UV-vis absorption is observed at around 430 nm, consistent with the formation of silver nanoparticles.
KW - ALIPHATIC AMINO LIGANDS
KW - COORDINATION POLYMERS
KW - RESONANCE-SPECTROSCOPY
KW - SILVER(I) COMPLEXES
KW - NANOPARTICLES
KW - TETRANUCLEAR
KW - COPPER(II)
KW - CHEMISTRY
KW - DINUCLEAR
KW - NETWORKS
UR - http://www.scopus.com/inward/record.url?scp=35948964890&partnerID=8YFLogxK
U2 - 10.1021/ic700872b
DO - 10.1021/ic700872b
M3 - Article
SN - 0020-1669
VL - 46
SP - 9090
EP - 9097
JO - Inorganic Chemistry
JF - Inorganic Chemistry
ER -