A 2-D coordination polymer incorporating cobalt(ii), 2-sulfoterephthalate and the flexible bridging ligand 1,3-di(4-pyridyl)propane

Abstract

A robust 2-D coordination polymer that maintains its single-crystallinity upon desolvation is reported.

CoOx nanoparticle anchored on sulfonated-graphite as efficient water oxidation catalyst

“…S2 and S3 † ). 31 As for discussion and comparison, Co 3 O 4 nanoparticles (Co 3 O 4 -nano), CoO x @G–O and CoO x @graphite nanocomposites were similarly synthesized by following the above hydrothermal process (the third step) except that the former was free of G-Ph-SO 3 H, the middle employed G–O to substitute G-Ph-SO 3 H, and the latter employed graphite to substitute G-Ph-SO 3 H. Commercial Co 3 O 4 was also employed for comparison.…”

Arylazoimidazole Coordinated and Naphthalene-Dicarboxylato Bridged Polymers of Co(II) and Photochromic Zn(II) Complexes

“…The Co–O bond lengths vary noticeably in the bridging partner: the NDC bridged Co 4 motif shows 2.008(3) and 2.016(3) Å, whereas the carboxylato chelated Co 2 motif shows 2.235(3) and 2.128(3) Å (Table ). In the chelated motif, both steric and angular strains may cause elongation of the bond length …”

“…In the chelated motif, both steric and angular strains may cause elongation of the bond length. 56 In 2, the coordination arrangement is [ZnNO 4 ] and central Zn(II) lies in a distorted square pyramidal center (τ5 = 0.1603) [for trigonal bipyramidal structure τ5 = 1, while a square pyramidal structure τ5 = 0]. 57,58 ClPai-Me acts as a monodentate imidazolyl-N donor, the Zn−N distance is 2.024(3) Å, which is comparable with reported data, 59 and the ClC 6 H 4 −NNgroup is freely suspended.…”

Utilization of mixed ligands to construct two new coordination polymers: Syntheses, structures and properties

“…The value of χ Μ slowly increases with decreasing temperature (almost constant values), from 0.018 emu mol À 1 at 300 K to 0.022 emu mol -1 at 13 K, and then exponentially, reaching a maximum of 0.043 emu mol -1 at 2 K. At 300 K, the χ Μ T value of 5.54 emu K mol -1 is much higher than the spin-only value of 3.78 emu K mol -1 expected for two noninteracting high-spin Co II ions (S¼3/2, g¼2.0). This magnetic behavior indicates the presence of a large orbital contribution arising from the 4 T 1g ground state of Co(II) ions, which is known to be significant in an octahedral or trigonal bipyramidal environment [58][59][60]. Upon cooling, the χ Μ T value gradually decreases to a minimum of 0.086 emu K mol -1 at 2 K, which is a typical behavior of the antiferromagnetic exchange coupling between the cobalt ions.…”