Transition metal and organometallic anion complexation agents

Electrochemical anion recognition with ferrocene functionalised macrocycles

“…Ferrocenylmethyl-(6-methyl-1,4,8,11-tetraazacyclotetradec-6-yl)-amine, L 3 Ferrocenecarbaldehyde (4 mmol, 0.86 g) was added to molten L 5 (4 mmol, 0.90 g) at 130 ЊC over a 2 min period with vigorous stirring. The reaction mixture was stirred for an additional 5 min under a stream of nitrogen, then allowed to cool to room temperature.…”

“…The significant role of anionic species in biology and the environment has led to increased investigation into designing molecules suited to their analytical determination by electrochemical methods. [2][3][4] Although it is imperative in the design of sensors to incorporate both a reporter and an appropriately selective binding domain, it is equally important that the overall molecular architecture of the sensor facilitates the reporter's ability to respond to and report the guest binding event. 5 That is, there must be an effective mechanism of communication between the binding site and the signaling unit in order to produce a functional receptor molecule.…”

“…1, 3 A variety of anion binding groups have been incorporated into ferrocene-based receptors, but most comprise amides in tandem with other groups such as calixarenes and metalloporphyrins. Like their amide counterparts, primary and secondary amines can also show a strong affinity for anions (A) through non-covalent N-H ؒ ؒ ؒ A interactions.…”

Chromogenic and fluorogenic chemosensors and reagents for anions. A comprehensive review of the year 2009

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] In fact, today a large number of coordination studies can be found in the literature describing a wide range of different ligands for anion coordination mainly involving hydrogen bonding, [15][16][17][18][19] electrostatic interactions [20][21][22][23][24][25][26][27] or coordination with suitable metal cations. [28][29][30][31][32][33] The nature of the binding sites and their specific spatial arrangement determine the binding constant with a certain anion and usually selective coordination can be found when a large host-guest complementarity is reached. An issue related with anion binding is the development of anion chemosensors or reagents.…”

Formation of a Unique 1:2 Calcium-Calixquinone Complex in Aqueous Media

“…

We report the complexation behavior of calix [4]arenemonoquinone-triacid (CTAQ), which is an electroactive and water-soluble receptor for calcium ion. UV-visible and NMR spectroscopic studies revealed that CTAQ in aqueous media forms 1:2 as well as 1:1 (metal ion:CTAQ) stoichiometric complexes with Ca

2+

, Sr

2+

, and Ba

2+

ions.

…”