A series of five new Cu2+ coordination polymers,
namely,
{[CuL
CH2
(DMF)](DMF)}
n
(1), {[CuL
CH2
(DMF)(2,2′-bipy)](CH3OH)}
n
(2), {[CuL
CH2
(2,2′-bipy)](2H2O)}
n
(3), {[CuLCH2
(H2O)(2,2′-bipy)](2H2O)}
n
(5), {[Cu2(L
S
)2(DMF)2](DMF)(CH3OH)(2H2O)}
n
(6), and three
discrete coordination complexes {[Cu2
L
CH2
(2,2′-bipy)2(CH3O)](ClO4)(CH3OH)} (4),
{[CuL
S
(2,2′bipy)](CH3OH)} (7), and {[CuLS(1,10-phen)](DMF)}
(8) have been prepared by the reaction of Cu(ClO4)2·6H2O and 1,1′-methylene-bis(2-naphthoxy
acetic acid) (LCH2
) or 1,1′-thio-bis(2-naphthoxy
acetic acid) (L
S
), with or without
the presence of 2,2′-bipyridine, under varying reaction conditions
or methods of crystallization or both. All the compounds were characterized
by elemental analysis, IR, thermogravimetric analysis, and single
crystal X-ray diffraction (XRD). The structures of LCH2
and L
S
obtained by single
crystal XRD indicated anti- orientation of the pendant arms which
upon metal complexation may turn into cis- orientation leading to
discrete metal ion complexes or may remain in anti- orientation leading
to extended multidimensional co-ordination polymers. The complexation
with Cu2+ led to five different coordination spheres which
in turn resulted in five different lattice structures. Thus, the present
paper demonstrates the design of coordination polymers that are rich
with mononuclear as well as dinuclear Cu2+ centers wherein LCH2
or L
S
coordinates in a monodentate as well as a bridging fashion leading
to the formation of one-dimensional curving, helical, and two-dimensional
networks.