Zn(II) binding by two tren-based tris-macrocycles has been analysed by means of potentiometric measurements in aqueous solutions. Both ligands form stable trinuclear Zn(II) complexes. Deprotonation of Zn(II)-coordinated water molecules gives mono-, di- and tri-hydroxo complexes. The ability of these trinuclear complexes as hydrolytic agents has been tested by using p-nitrophenyl acetate and bis(p-nitrophenyl) phosphate (BNPP) as substrates. BNPP cleavage takes place through a bridging interaction of the substrate with at least two metals and simultaneous nucleophilic attack of a Zn-OH function at phosphorus. A significant increase of the hydrolysis rate with respect to the mononuclear Zn(II) complex with [12]aneN4 is observed.

Zn(II) coordination to tren-based tris-macrocycles. Activity of their trinuclear Zn(II) complexes in carboxy- and phosphate-ester hydrolysis / C.BAZZICALUPI; A. BENCINI; E. BERNI; C. GIORGI; S.MAOGGI; B.VALTANCOLI. - In: DALTON TRANSACTIONS. - ISSN 1477-9234. - STAMPA. - ...:(2003), pp. 3574-3580. [10.1039/b306577d]

Zn(II) coordination to tren-based tris-macrocycles. Activity of their trinuclear Zn(II) complexes in carboxy- and phosphate-ester hydrolysis

BAZZICALUPI, CARLA;BENCINI, ANDREA;GIORGI, CLAUDIA;VALTANCOLI, BARBARA
2003

Abstract

Zn(II) binding by two tren-based tris-macrocycles has been analysed by means of potentiometric measurements in aqueous solutions. Both ligands form stable trinuclear Zn(II) complexes. Deprotonation of Zn(II)-coordinated water molecules gives mono-, di- and tri-hydroxo complexes. The ability of these trinuclear complexes as hydrolytic agents has been tested by using p-nitrophenyl acetate and bis(p-nitrophenyl) phosphate (BNPP) as substrates. BNPP cleavage takes place through a bridging interaction of the substrate with at least two metals and simultaneous nucleophilic attack of a Zn-OH function at phosphorus. A significant increase of the hydrolysis rate with respect to the mononuclear Zn(II) complex with [12]aneN4 is observed.
2003
...
3574
3580
C.BAZZICALUPI; A. BENCINI; E. BERNI; C. GIORGI; S.MAOGGI; B.VALTANCOLI
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/201409
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