Complexation and extraction of non-ferrous metals by calix[n]arene phosphine oxides |
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| Authors: | G A Kostin T V US T M Korda V G Torgov N V Kuratieva S I Miroshnichenko V I Kalchenko |
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| Institution: | 1. Nikolaev Institute of Inorganic Chemistry SB RAS, Av. Lavrentieva, 3, Novosibirsk, Russia, 630090
2. Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska str. 5, Kyiv-94, 02660, Ukraine
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| Abstract: | The extraction of non-ferrous metal (M2+) nitrates by the calix4,6]arenes (L), bearing four or six phosphine oxide donor groups at the upper or at the lower rim, was quantitatively described in the form of Mn(NO3)2nL] (n = 1, 2) complexes. The extraction constants (Zn2+ > Cu2+ > Co2+ > Ni2+) for the both types of L coincide with Irving-Williams sequence. Calix4]arenes, phosphorylated at the lower (narrow) rim, provide better stability of ML complexes because of the best spatial fitting of M2+ by the donor groups. For the upper (wide) rim phosphorylated calix4]arenes M2L and ML2 complexes are more stable. Unusual zwitterionic Co2(NO3)4L] complex of the lower rim tetraphosphorylated calix4]arene 1 was determined by X-ray structural analysis. |
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