Square planar silver(I) complexes: A rare but increasingly observed stereochemistry for silver(I)

Silver and Copper Complexes with closo-Polyhedral Borane, Carborane and Metallacarborane Anions: Synthesis and X-ray Structure

“…This variety is mainly due to the lack of stereochemical preference that arises from the d 10 configuration. Furthermore, the weak nature of the silver-ligand bond means that in the solid state, weak interactions and crystal packing forces have a greater influence on structure than may be expected in more robust metal-ligand systems [8][9][10]. Copper(I) has the same d 10 configuration and its coordination chemistry in some cases resembles coordination chemistry of silver(I) [11].…”

“…The average Ag-Br distance of 2.778 Å is close to those found in {Ag(η 2 -toluene)[1-CB9H5-6,7,8,9,10-Br5]}n. The asymmetric η 2 benzene coordination has Ag-C distances of 2.629 (8) The silver salts of C-substituted perchloro and perbromo derivatives of 1-carba-closo-decaborate anion, Ag[1-Bn-1-CB 9 Cl 9 ] and Ag[1-H 2 N-1-CB 9 Br 9 ], were prepared by treatment of the corresponding sodium salts with AgNO 3 in aqueous solution [74]. The silver salt of the perbromo derivative of 1-carba-closo-decaborate anion, Ag[1-HCB 9 Br 9 ], was prepared by the metathesis of Cs[1-HCB 9 Br 9 ] with AgNO 3 from aqueous solution and crystallized from benzene/THF solution to give {Ag(η 2 -benzene)[1-HCB 9 Br 9 ]} n [74]. The [1-HCB 9 Br 9 ]´anions act as bridging ligands in a one-dimensional coordination polymer chain, an increasingly familiar motif in silver carborane structures.…”

“…The silver salt of the perbromo derivative of 1-carba-closo-decaborate anion, Ag[1-HCB 9 Br 9 ], was prepared by the metathesis of Cs[1-HCB 9 Br 9 ] with AgNO 3 from aqueous solution and crystallized from benzene/THF solution to give {Ag(η 2 -benzene)[1-HCB 9 Br 9 ]} n [74]. The [1-HCB 9 Br 9 ]´anions act as bridging ligands in a one-dimensional coordination polymer chain, an increasingly familiar motif in silver carborane structures. The silver atom is in a trigonal arrangement of one η 2 -benzene and two monodentate bridging carborane anions.…”

Structural control: can [2 × 2] silver grids be formed from 4,5-disubstituted 3,6-di(2-pyridyl) pyridazines?

“…The pyridine rings are twisted much less than any of the examples described above IJ37.5IJ1)°and 27.1IJ1)°for 4, and 29.3IJ1)°and 31.8IJ1)°for 5), with this twisting attributed to the steric clash between the -CH 2 -of the alkyl ring and the pyridine ring. The increased co-planarity of the rings leads to less pyramidalisation of the coordinated nitrogen atoms IJ26.2IJ2)°and 19.4IJ2)°for 4, and 26.7IJ2)°and 27.9IJ2)°for 5), while the silver atoms are tetracoordinate and have a distorted square planar geometry, 23 and are held 3.6056(2) Å and 3.5466(2) Å apart for 4 and 5, respectively. The subunits are able to form π-π stacks with centroid-to-centroid distances of 3.638(2) Å for 4, and 3.740(3) for 5, although these only involve the pyridine rings.…”

Mixed Linker Strategy for the Construction of a Fluorescent 2D Network Based on [Ag2(COO)2] as Secondary Building Unit

“…The Ag(I) ion with its d 10 closed-shell electron configuration shows diverse coordination geometries including linear, trigonal-planar, tetrahedral, trigonal-bipyramidal, and octahedral geometry [18,19]. Aminopyrimidine and its derivatives are neutral ligands widely used as connectors in the construction of metal-containing compounds.…”