Syntheses, Structures, and Photoluminescence of a Series of d¹⁰ Coordination Polymers with R-Isophthalate (R = −OH, −CH₃, and −C(CH₃)₃)

Abstract

Eight new d 10 metal-organic coordination polymers, [Zn(mip)(bpa)] n (1), [Zn(mip)were prepared through hydrothermal reactions of H 2 mip or H 2 tbip (H 2 mip = 5-methylisophthalic acid and H 2 tbip = 5-tert-butylisophthalic acid) with different pyridyl-containing ligands (bpa = 1,2-bis(4-pyridyl)ethane, bpp = 1,3-bis(4-pyridyl)propane, dpe = 1,2-di(4-pyridyl)ethene and bipy = 4,4 0 -bipyridine), respectively. Except for complexes 2 and 6, all the other six compounds were reported for the first time. These complexes were structurally characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. Complex 1 is a 3-fold interpenetrating three-dimensional (3D) network with CdSO 4 topology constructed from alternately left-handed and right-handed helical channels. Complexes 2 and 3 are 4fold interpenetrated diamondoid-like networks. Polymers 4 and 5 are isostructural, showing 2-fold 3D interpenetrating R-Po networks constructed from binuclear zinc nodes. Complex 6 possesses a two-dimensional (2D) corrugated network. Complex 7 has a one-dimensional (1D) tube-like chain along the a direction and is further linked by hydrogen bonding and π-π stacking interactions to form a 3D supramolecular network. Complex 8 features a 2D layer and further forms a 3D supramolecular framework by hydrogen bonding. These results show that the influence of steric hindrance of an organic ligand on the structures of d 10 coordination polymers is realized through changing the substituted groups of the dicarboxylate derivatives. Furthermore, thermal stabilities and photoluminescent properties of the complexes were also studied in the solid state.

Structures and Fluorescent Properties of Cadmium(II) Complexes with 1D and 2D Structures Based on Tridentate Benzimidazole Ligands

“…Due to the d 10 configuration of cadmium(II), these emissions are neither ligand-to-metal transfer (LMCT) nor metal-to-ligand charge transfer (MLCT). [38,39] Hence, we conclude that the four emission bands are from ILCT (intraligand charge transfer) predominantly (especially π*Ǟπ), similar to other complexes of d 10 configuration containing benzimidazole ligand. [40,41] …”

Crystal structure of catena[(tetraaqua-bis(μ2-(4,4'-bipyridine-κ2N:N'))- nickel(II)][(diaqua-bis(3-methyl-4-amino-benzensulphonate-κ1O)-bis(μ2- (4,4'-bipyridine-κ2N:N'))nickel(II)]—3-methyl-4-aminobenzensulphonate— ethanol (1:2:2), C52H72N8Ni2O20S4

“…On the other hand, rodlike N,N'-donor building blocks, such as 4,4'-bipyridine, are widely employed to construct coordination polymers [7][8][9][10]. Herein, we report an ew three-dimensional Ni(II) supramolecular coordination polymeric network constructed by 3-methyl-4-amino-benzensulphonic acid and 4,4'-bipyridine.…”

Two Organic Cation Salts Containing Tetra(isothiocyanate)cobaltate(II): Synthesis, Crystal Structures, Spectroscopic, Optical and Magnetic Properties

“…As seen in Figure 7a, upon excitation at 241 nm, compound 1 showed two main luminescent emission peaks at 395 nm and 290 nm, while the main emission bands of both 2 and intermediate [BzQl]Br were found at 289 nm and 394 nm (Figure 7b), which may be attributed to the π*→π or n→π transition [27]. In addition, compounds 1 and 2 exhibited a strong emission band at 408 nm and a relatively weak emission band at 448 nm, which may be tentatively assigned to the metal-to-ligand charge transfer band between the Co(II) and the unoccupied π* orbitals of the isothiocyanate groups [28].…”