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Since, complex (1) is chiral, it is the mixture of two crystalline forms P65 and P61.  Both space groups were refined for comparison.  The space group P61 gave better results.  The R-factor is also better than the former hexagonal P65 .  The absolute structure for complex (1) has been checked and determined with a Flack parameter of 0.003 (1) (see Table 1).
The asymmetric unit of title complex (1) consists of only one type of Cu2+ ion which adopts an octahedral environment coordinating to four O-atoms and two N-atoms.  Three of the O-atoms are water molecules and another from the pendant sulfate anion.  Additionally, two crystallographically distinct N-atoms are from two trans 4,4¡¯-bipy molecules (see Figs. 1 and 2).  The 4,4¡¯-bipy molecules in (1) play a crucial role in linking two adjacent Cu2+ atoms to form the 1D chains of {[Cu(4,4¡¯-bipy)(H2O)3(SO4)]}n that align along the crystallographic c axes (see Figs. 1 and 3).  The interchains void is occupied by the other two free water molecules, therefore resulting in the empirical formula {[Cu(4,4¡¯-bipy)(SO4) (H2O)3] 2H2O}n.  Unfortunately, the structure didn¡¯t contain L-glutamic acid as planned and the actual role of L-glutamic acid in this work is ambiguous.

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