The maximum Cu(II), Ni(II), and Co(II) ion capacities of a silica−poly(ethyleneimine) composite (WP-1) are compared with those of the commercially available iminodiacetic acid chelator resin Amberlite IRC-718. Under batch (static) conditions, IRC-718 exhibits better capacities for these metals than WP-1. Dynamic studies, however, revealed that WP-1 possessed a much higher capacity for all three divalent metals than IRC-718, with relative metal capacities in the order Cu(II) > Co(II) ≈ Ni(II). In the presence of the competing chelator ethylenediaminetetraacetic acid, the Cu(II) capacities of WP-1 and IRC-718 lost 48% and 45%, respectively, of their original adsorption values. Even with this decrease, however, WP-1 maintained a higher Cu(II) capacity than IRC-718. Repeated cycle testing, using Cu(II) solutions at both room temperature and 97 °C, was conducted to compare the long-term stability of each material. WP-1 maintained 94% of its original Cu(II) capacity and maintained structural integrity after 3000 cycles using room temperature copper solutions, while IRC-718 compressed and dropped to 64% of its original capacity. When boiling copper solutions were used, the capacity of WP-1 increased slightly over 1500 cycles, while IRC-718 lost 13% of its original copper capacity and again became compressed, indicating degradation of the polystyrene beads.

Addition of [Cp*Ru(MeCN) 3 ]PF 6 to M(PcOEt) (PcOEt ) octakis(ethoxy)phthalocyanine; M ) H 2 , Ni (1), Cu, VO) in dichloromethane results in the formation of {Cp*Ru[η 6 -M(PcOEt)]}PF 6 . The molecular structure of 1 reveals η 6 -coordination of Cp*Ru 2+ to one of the isoindole subunits of the phthalocyanine ligand. The crystal structure reveals the presence of two cofacially stacked Pc units in the asymmetric unit separated by 3.27-3.36 Å. In [Cp*Ru(η 6 -H 2 PcOEt)]PF 6 , two distinct N-H sites are apparent in the 1 H NMR and IR spectra, but only one is exchangeable. The coordinated macrocycle can be metalated. The UV and electrochemical data indicate that the π-bonded metal center functions as an electron-donating substituent. Luminescence studies indicate that the η 6 -coordination quenches fluorescence to a lesser degree than coordination of metals into the N 4 pocket of the phthalocyanine subunit.

No abstract

No abstract

No abstract

No abstract

No abstract