4119-52-2Relevant articles and documents
Coordination-driven self-assembly of a series of dinuclear M2L2mesocates with a bis-bidentate pyridylimine ligand
Chainok, Kittipong,Dungkaew, Winya,Jiajaroen, Suwadee,Jittirattanakun, Siripak,Kielar, Filip,Puangsing, Praifon,Rungtaweevoranit, Bunyarat,Saphu, Watcharin,Sukwattanasinitt, Mongkol,Theppitak, Chatphorn
, p. 7736 - 7743 (2021/06/16)
Four isostructural dinuclear M2L2mesocates of the general formula [M2(NCS)4(L)2]·4.5MeOH (1M; M = Mn, Fe, Co, Zn) were constructed by using the coordination-driven self-assembly of the [M(NCS)2] precursor and the flexible bis-bidentate pyridylimine Schiff base ligand L (L = 4,4′-(1,4-phenylenebis(oxy))bis(N-(pyridin-2-ylmethylene)aniline). The centrosymmetric M2L2mesocate forms through the side-by-side coordination of two L ligands to a pair of M(ii) ions. The mesocates exhibit a reversible temperature induced desolvation-solvation behavior without losing their structural integrity. The activated1Co, as the representative M2L2mesocate, shows an exceptionally high MeOH vapour uptake capacity of 481.9 cm3g?1(68.8 wt%) at STP with good recyclability. Notably, it also exhibits CO2adsorption with an uptake capacity of 20.2 cm3g?1(3.6 wt%) at room temperature and 1 bar.
Tuning of crystallization method and ligand conformation to give a mononuclear compound or twodimensional SCO coordination polymer based on a new semi-rigid V-shaped bis-pyridyl bis-amide ligand
Cao, Tong,Dou, Yong,Hao, Xiaoyun,Li, Dacheng,Liu, Hui,Liu, Qingyun,Qin, Lan,Yang, Lu,Zhang, Daopeng,Zhou, Zhen
, p. 412 - 418 (2020/05/18)
With the new semi-rigid V-shaped bidentate pyridyl amide compound 5-methyl- N,N0-bis(pyridin-4-yl)benzene-1,3-dicarboxamide (L) as an auxiliary ligand and the FeII ion as the metal centre, one mononuclear complex, bis(methanol-O)bis[5- methyl-N,N0-bis(pyridin-4-yl)benzene-1,3-dicarboxamide-N]bis(thiocyanato-N)- iron(II), [Fe(SCN)2(C19H16N4O2)2(CH3OH)2] (1), and one two-dimensional coordination polymer, catena-poly[[[bis(thiocyanato-N)iron(II)]-bis[-5-methyl- N,N0-bis(pyridin-4-yl)benzene-1,3-dicarboxamide-2N:N0]] methanol disolvate dihydrate], {[Fe(SCN)2(C19H16N4O2)2]2CH3OH2H2O}n (2), were prepared by slow evaporation and H-tube diffusion methods, respectively, indicating the effect of the method of crystallization on the structure type of the target product. Both complexes have been structurally characterized by elemental analysis, IR spectroscopy and single-crystal X-ray crystallography. The singlecrystal X-ray diffraction analysis shows that L functions as a monodentate ligand in mononuclear 1, while it coordinates in a bidentate manner to two independent Fe(SCN)2 units in complex 2, with a different conformation from that in 1 and the ligands point in two almost orthogonal directions, therefore leading to a two-dimensional grid-like network. Investigation of the magnetic properties reveals the always high-spin state of the FeII centre over the whole temperature range in 1 and a gradual thermally-induced incomplete spin crossover (SCO) behaviour below 150 K in 2, demonstrating the influence of the different coordination fields on the spin properties of the metal ions. The current results provide useful information for the rational design of functional complexes with different structure dimensionalities by employing different conformations of the ligand and different crystallization methods.
A thermal- and light-induced switchable one-dimensional rare loop-like spin crossover coordination polymer
Lan, Wenlong,Valverde-Mu?oz, Francisco Javier,Dou, Yong,Hao, Xiaoyun,Mu?oz, M. Carmen,Zhou, Zhen,Liu, Hui,Liu, Qingyun,Real, José Antonio,Zhang, Daopeng
, p. 17014 - 17021 (2019/11/26)
Rare loop-like isostructural one-dimensional coordination polymer (1D-CP) systems formulated as {Fe(DPIP)2(NCSe)2}n·4DMF (1) and {Fe(DPIP)2(NCSe)2}n·4DMF (2) were obtained by self-assembling FeII and pseudohalide NCX-(X = S, Se) ions in presence of the V-shaped bidentate bridging ligand, namely, N,N′-dipyridin-4-ylisophthalamide (DPIP), and were characterized by elemental analysis, IR spectroscopy, TGA, single crystal X-ray diffraction and powder X-ray diffraction. The magnetic studies show that complex 2 undergoes a complete thermally induced spin crossover (SCO) behavior centered at T1/2 = 120 K with ca. 5 K thermal hysteresis loop and light-induced excited spin state trapping effect (LIESST) with TLIESST = 65 K. However, either the homologous X = S (1) or the desolvated form of complex 2 is high spin at all temperatures, proving further the concerted synergy for the SCO of 2 between the intrinsic ligand field and that indirectly induced via hydrogen bond interaction. The current results provide valuable information for the design of new 1D SCO systems via the rational control of the cooperated effects derived from the intramolecular coordination bond and the intermolecular supramolecular interactions.
