The organo-amidocuprate [Cu(2)Li(2)Mes(2)(N(CH(2)Ph)(2))(2)] is solvated by thf to yield the monomeric contact ion pair complex [MesCuN(CH(2)Ph)(2).Li(thf)(3)] in which the Li cation is bound to the amido nitrogen; this behaviour differs significantly from that observed in diorganocuprates which favour solvent separate ion pairs.

In this study a sensitive, simple and accurate spectrophotometric method was suggested for determination of tamsulosin in bulk powder and pharmaceutical dosage form based on the formation of an ion-pair complex between the drug and bromocresol green in a buffer solution at pH 3.5. The formed yellow color complex was extracted with chloroform and measured at 415 nm. The optimum reaction conditio...

an extraction-spectrophotometric method for the determination of trace amounts of ammonium ion is described. ammonium ion is effectively extracted as a neutral ternary complex nh . db 18c6. calmagite at ph 3.0 into chloroform, followed by spectrophotometric determination at =48 5 nm. molar absorptivity of the ternary complex at this wavelength is 1.08 10 mol cm . beer's law is obeyed over ...

Two simple, rapid and inexpensive methods based on spectrophotometry and turbidimetry have been developed for the determination of cyproheptadine hydrochloride (CPH) in pure form and in dosage forms with Bromophenol Blue (BPB) as the reagent. The spectrophotometric method is based on the formation of an ion-pair complex between the drug and BPB in an acidic buffer. The ion-pair complex formed, ...

Association constants of a bis-(acetylguanidinium)ferrocene dication to various (di)carboxylates were determined through UV-vis titrations. Association constant values greater than 10(4) M(-1) were determined for both phthalate and maleate carboxylates to the bis-(acetylguanidinium)ferrocene salt in pure water. Density functional theory computations of the binding enthalpy of the rigid carboxyl...

A bis(phenoxy-amine)ZrMe(2) complex (1) was synthesized and activated with B(C(6)F(5))(3) obtaining an ion pair (2) having the MeB(C(6)F(5))(3)(-) counterion in the second coordination sphere as deduced by NMR studies. Both DFT calculations and NMR investigations suggest that the activation is coupled with a change of the binding modality of the tetradentate ligand from cis(N,N)-trans(O,O) in t...

the effects of coatingtreatments (waxand plasticbags) combined with methylsalicylate on the fruit quality and chilling injury of moro blood orange were studied during storage. treated fruits were kept in storage for 80 days at 5 oc and 90-95% relative humidity. some characteristics such as pulp and skin total phenolics, antioxidant capacity, total anthocyanin, lipid peroxidation, and the chilli...