Anion recognition and luminescent sensing by new ruthenium(II) and rhenium(I) bipyridyl calix[4]diquinone receptors

Abstract

New ruthenium(ii) and rhenium(i) bipyridyl calix[4]diquinone receptors have been prepared and shown to selectively bind and sense acetate anions via remarkable luminescent emission intensity retrieval effects.

Tris(rhenium fac-tricarbonyl) Polypyridine Functionalized Cyclotriguaiacylene Ligands with Rich and Varied Emission

“…While there are no previous examples of Re(CO)3X moieties being appended to CTV-type host molecules, there are a number of reports of other classes of macrocyclic host molecules being decorated in this fashion. For example, decoration of calixarenes with [Re(CO)3X(bpy) (Bpy = 2,2'-bipyridyl) groups at the upper 18,19 or lower calixarene rim 20,21 have been reported, and includes cases of complexes showing luminescence sensing behavior for fullerenes 18 or anions. 20 The Re(CO)3Br unit has also been employed as a building tecton to link pyridyl appended cavitands into ditopic cavitand assemblies, 22 and as metallobridges to stabilize the extended cavity of an expanded calix [4]arene.…”

“…For example, decoration of calixarenes with [Re(CO)3X(bpy) (Bpy = 2,2'-bipyridyl) groups at the upper 18,19 or lower calixarene rim 20,21 have been reported, and includes cases of complexes showing luminescence sensing behavior for fullerenes 18 or anions. 20 The Re(CO)3Br unit has also been employed as a building tecton to link pyridyl appended cavitands into ditopic cavitand assemblies, 22 and as metallobridges to stabilize the extended cavity of an expanded calix [4]arene. 23 In related work, the fac-Re(CO)3 unit has been used to build a variety of metallacyclic, metallacage or metallacavitand complexes.…”

Chromo- and Fluorogenic Organometallic Sensors

“…Similarly, the calix [4]arene appended complex 6d (Fig. 6) demonstrates a selectivity for OAc À with a marked revival of the quenched emissive behaviour on the introduction of the anions [63]. In another example, the inclusion of the positively charged pseudorotaxane thread within a macrocyclic complex (6e-6h; Fig.…”

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

“…[22][23][24][25][26] Several groups have employed luminiscent ruthenium complexes with substituted bipyridines as chemical sensors for anions. [27][28][29][30][31][32][33][34][35] More recently, Gale and Loeb have reported a series of platinum complexes with substituted pyridine ligands as metalla-receptors for anions 20,36,37 while Anslyn has demonstrated that copper complexes of tridentate ligands (with a C 3v symmetry) can selectively bind phosphates with high associations constants. 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).…”