Substituent groups-driven construction of two different Cd(II) coordination polymers from CdSO4, tetrakis(4-pyridyl)cyclobutane and 5-R-1,3-benzenedicarboxylates

Hydrothermal reactions of CdSO4 with tetrakis(4-pyridyl)cyclobutane (tpcb) and 1,3-benzenedicarboxylic acid (1,3-H2BDC) or 5-nitro-1,3-benzenedicarboxylic acid (5-NO2-1,3-H2BDC) resulted in the formation of two coordination polymers [Cd(tpcb)0.5(1,3-BDC)]n (1) and {[Cd2(tpcb)(5-NO2-1,3-BDC)2(OH2)2] · 4H2O}n (2), respectively. Compounds 1 and 2 were characterized by elemental analysis, IR, powder X-ray diffraction, and single-crystal X-ray diffraction. 1 and 2 exhibit two different types of two-fold interpenetrating 3D architectures with (66)2(64 · 82) and (52 · 8)(54 · 6∙8)(4 · 53 · 62 · 7 · 82 · 10) Schläfli symbols, respectively. Their thermal and photoluminescent properties were also investigated.