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A new ligand, 4-(4-carboxyphenyl)-6-(pyrazin-2-yl)picolinic acid (H 2 L1), was used to construct four isostructural one-dimensional (1 D) zig-zag chain coordination polymers ([M(L1)(H 2 O) 2 ]·3H 2 O, M = Mn ( 1 ), Co ( 2 ), Cd ( 3 ) and Zn ( 4 )). Moreover, when changing the ligand substituent group from pyrazine ring to furan ring, another new ligand, 4-(4-carboxyphenyl)-6-(furan-2-yl)picolinic acid (H 2 L2), was synthesized. Based on H 2 L2, different structural 1 D coordination polymers, ([Mn(L2)(H 2 O) 2 ] ( 5 ) and [Ni(L2)(H 2 O) 2 ]·H 2 O ( 6 )), have been obtained under the same solvothermal conditions as for the syntheses of isostructural  1 – 4 . Interestingly, only through changing the ligand substituent group, the 1 D isostructural zig-zag chain ( 1 – 4 ) was adjusted to a 1 D molecular box chain ( 5 ) and 1 D linear chain ( 6 ), which should be ascribed to ligand substituent group effects. The various 1 D chain structures originate from the types of ligand substituent group: the substituent group with a pyrazine ring only yields isostructural coordination polymers  1 – 4 , whereas the substituent group with a furan ring can construct different structural coordination polymers, such as a 1 D molecular box chain ( 5 ) or a 1 D linear chain ( 6 ). The photoluminescent properties of all coordination polymers were also examined.

From isostructural to hetero-structural one-dimensional coordination polymers adjusted by changing the ligand substituent group from pyrazine to furan