| Abstract: Two cobalt(Ⅱ) coordination polymers, [Co(OBIX)(FBA)]n (1) and [Co2(BIMB)2(FBA)2]n (2)(H2FBA=4,4'-(hexafluoroisopropylidene)bis(benzoic acid), OBIX=1,2-bis(imidazol-1-ylmethyl)benzene and BIMB=4,4'-bis(imidazol-1-ylmethyl)biphenyl), have been synthesized and characterized by IRspectroscopy, elemental analysis and single-crystal X-ray diffraction. Complex 1 crystallizes in monoclinic, space group P21/c with a=1.42243(4) nm, b=1.66230(4) nm, c=1.23468(3) nm, β=96.683 (2)°, V=2.89957(13) nm3, C31H22F6N4O4Co, Mr=687.46, Dc=1.575 g·cm-3, F(000)=1396, μ=0.676 mm-1 and Z=4. Complex 2 belongs to monoclinic, space group P21/c with a= 1.41629(3) nm, b=2.97964(6) nm, c=1.82255(5) nm, β=110.7160(10)°, V=7.1939(3) nm3, C74H52F12N8O8Co2, Mr=1527.10, Dc=1.410 g·cm-3, F(000)=3112, μ=0.553 mm-1 and Z=4. The final R1=0.0612 and wR2=0.1245 for 6368 observed reflections (I>2σ(I)). Structural analyses reveal that complex 1 exhibits a one-dimensional tubular structure consisting of alternating rings and rods, whereas complex 2 possesses a two-dimensional polycatenated framework which is generated by joining both Pand Mhelices by BIMBligands. The results show that ancillary ligands play a significant role in the structure of the final products. CCDC: 924709, 1; 924710, 2. |
