A di-palladium urea complex as a molecular receptor for anions

Abstract

A new di-nuclear palladium complex containing thiol-urea ligands has been prepared, structurally characterized and its interaction with anionic species studied in solution.

Anion Recognition and Templation in Coordination Chemistry

“…palladium, platinum and gold); this opens the possibility of preparing a range of complexes with different geometries. [63] In the process of investigating these complexes, we came across an interesting compound in which the urea groups were shown to interact (in the solid state) with a sodium cation (the origin of which could be traced back to the NaOtBu used to deprotonate the thiol) and an extra triflate. Once the thiols were prepared by the synthetic procedure shown above, their reactions with [Pd(dppp)(OTf) 2 ] were carried out to afford the expected dinuclear complexes with bridging thiolato-urea groups (see Scheme 5).…”

Anion Binding and Luminescent Sensing using Cationic Ruthenium(II) Aminopyridine Complexes

“…Metal ions are important structural and signalling elements in anion-binding and sensing systems. [1][2][3][4][5][6][7][8][9][10] The metal may play either i) a structural role, [11][12][13][14][15] ii) it may form a key component of the anion binding site [3,16,17] or iii) it may act as part of a redox, luminescent or colourimetric reporter group. [7,10,[18][19][20][21][22][23] Generally inert metal-containing fragments such as metallocenes, arene complex of d 6 metals, or tris(bipyridyl) type complexes have been used predominantly in a reporting role.…”

Di-palladium Complexes with Urea-containing Ligands as Anion Receptors

“…In our preliminary communication 46 we reported that [Pd(dppp){µ- 2 ] and one equivalent of thiol (2) in the presence of NaO t Bu (See Scheme 2).…”

“…The Ka values for metallo-receptor 1 were already reported in our preliminary communication. 46 c Standard deviation corresponding to the fit of the experimental data to the calculated curve. metallo-receptors).…”

“…38 As part of our ongoing interest in developing metalla-receptors for anions, [39][40][41][42][43][44][45] we have recently reported in a preliminary communication the synthesis and crystal structure of di-palladium complex 1 (see Figure 1). 46 This compound has demonstrated to bind anions in DMSO solutions. …”