Structural diversities in the Zn(II), Mn(II) and Cd(II) coordination polymers induced by metal ions and/or anions

From zero-dimensional metallomacrocycle to three-dimensional metal–organic frameworks mediated by solvent polarity: near-white light emissions and gas adsorption properties

“…All Mn–O/N bond lengths in 1 and 2 are consistent with the corresponding bond lengths reported in the literature for the Mn II complex. 23 In 2 , two L1 2− ligands connect two Mn II centers (Mn⋯Mn distance of 5.806 Å) by using one bidentate-chelated picolinic acid group and one monodentate pyridyl nitrogen atom to form a rhombus binuclear secondary building unit (SBU, Fig. S12, ESI†).…”

“…25 The Zn-O bond lengths range from 1.908(3) to 2.023( 3) Å (Table S1, ESI †), which are consistent with the corresponding bond lengths reported in the literature for the Zn coordination polymer. 23 In 6, two L2 4− ligands bridge two tetrahedral Zn1 II centers via a monodentate carboxylate oxygen atom, resulting in a quasi-hexagonal Zn 2 L2 2 -type metallocyclic motif, while the remaining two sites of each tetrahedral Zn1 II center are coordinated by two water molecules (Fig. 3b).…”

“…These results indicate the CO 2 adsorption capacity is relative to the framework stability of MOFs. 23,26 Photoluminescence spectra Solid-state PL spectra of H 2 L1 and H 4 L2 ligands, 0D metallomacrocycle 1, 3D MOFs 3, 5, and 2D Fig. 5 The N 2 gas adsorption-desorption isotherms at 77 K for activated 2-5.…”

“…As shown in Fig. 6, the CO 2 gas adsorption isotherms of the activated 2-5 samples were measured at 273 K. 2 shows a higher CO 2 adsorption capacity of 92.24 cm 3 g −1 (18.44 wt%) at 273 K and P/P 0 = 1.0, whereas 4 reveals relatively low CO 2 adsorption capacity of 33.98 cm 3 g −1 (6.79 wt%) at 273 K and P/P 0 = 1.0, which is probably due to its lower framework stability, 23,26 as indicated by the TGA curve of the activated sample of 4 (Fig. S16, ESI †).…”

From two-dimensional networks to three-dimensional metal–organic frameworks mediated by solvent ratio: luminescence and gas adsorption properties

“…This picolinic acid derivative possesses a π-conjugated rigid backbone. Some interesting CPs and MOFs based on picolinic acid derivative ligands have been reported by our group 11 c ,13 and other 14 groups; it is necessary to exploit novel CPs or MOFs with various structures and/or properties by using new picolinic acid derivative ligands. Based on this new ligand, and only through changing the solvent ratio, two new two-dimensional (2D) CPs 1 ([Co(L) 2 ] n ) and 2 ({[Co 3 (L) 4 (NO 3 ) 2 (H 2 O) 4 ]·2H 2 O} n ), and two novel isostructural three-dimensional (3D) MOFs 3 ({[Co(L)(NO 3 )(H 2 O)]·0.5H 2 O} n ) and 4 ({[Ni(L)(NO 3 )(H 2 O)]·0.5H 2 O} n ) have been solvothermally synthesized and structurally characterized.…”