Synthesis, Structure, and Fluorescence of the Novel Cadmium(II)−Trimesate Coordination Polymers with Different Coordination Architectures

Abstract

Three novel complexes, Cd3tma2*13H2O (1), Cd3tma2*dabco*2H2O (2), and Cd3Htma3*8H2O (3) (tma = trimesate), of cadmium(II)-trimesate coordination polymers are obtained from hydrothermal reaction. 1 (C18H32O25Cd3) crystallizes in the monoclinic C2/c space group [a = 18.985(2) A, b = 7.3872(6) A, c = 20.432(2) A, = 97.1660(10), and Z = 4]. 2 (C24H22N2O14Cd3) crystallizes in the monoclinic P2(1)/c space group [a = 10.1323(2) A, b = 19.5669(5) A, c = 13.15880(10) A, = 108.9810(10), and Z = 4]. 3 (C27H28O26Cd3) belongs to the trigonal P31c space group [a = 15.7547(3) A, b = 15.7547(3) A, c = 7.93160(10) A, and Z = 2]. The Cd(II) centers in the three complexes are bridged by tma ligands in the coordination fashion of unidentate, bridging unidentate, bidentate, chelating bis-bidentate, chelating/bridging bis-bidentate, or chelating/bridging bidentate to form the T-shaped molecular bilayer motif for 1, chicken-wire-like motif for 2, and honeycomb-like porous structure for 3, respectively, in which the T-shaped molecular bilayer motif and chicken-wire-like motif are further interlinked in interdigitating or alternating fashion to construct the different coordination architectures. These three complexes exhibit strong fluorescent emission bands at 355 nm (lambda(ex) = 220 nm) for 1, 437 nm (lambda(ex) = 365 nm) for 2, and 353 nm (lambda(ex) = 218 nm) for 3 in the solid state at room temperature.

A Cadmium Anionic 1-D Coordination Polymer {[Cd(H2O)6][Cd2(atr)2(μ2-btc)2(H2O)4] 2H2O}n within a 3-D Supramolecular Charge-Assisted Hydrogen-Bonded and π-Stacking Network

“…The absence of a peak at ca 1715 cm −1 indicates the full deprotonation of the H3btc ligand. Additionally, the asymmetric and symmetric stretching vibrations of the carboxylate group [27,28] are observed at 1607 cm −1 , 1204 cm −1 , and 1527 cm −1 , 1110 cm −1 , which reveal different binding modes of the carboxylate group. Bands at 752 cm −1 and 731 cm −1 in the fingerprint region are due to 1,3,5-trisubstituted benzene [27].…”

Crystal structure of catena-poly[diaqua-(μ2-5-methylisophthalato-κ2 O:O′)(μ2-1,4-bis((1H-1,2,4-triazol-1-yl)methyl)benzene-κ2 N:N′)], NiC21H22O6N6

“…The results show that different substituents lead to different structures and properties. However, the study of CPs based on 5-methylisophthalate has been reported rarely [16,17]. In order to study the effect of a single methyl group on structural topologies and physicochemical properties we chose 5-methylisophthalic acid along with 1,4-bis(triazol-1-ylmethyl) benzene to elaborate new complexes.…”

3D Coordination Network of Ag(I) Ions with μ 3 -Bridging Melamine Ligands

“…(n ? 1)p electronic transitions, which are often associated with metal-to-ligand (MLCT), LMCT and/or ligandto-ligand charge transfer (LLCT) [40][41][42][43]. To understand the emission profile of our complex, an MO calculation was carried out.…”

“…The deviation between the calculated and experimental value in the MO calculation may be attributable to two main reasons: (i) a simplified representative fragment of 1 (corresponding to the crystallographic repetitive unit) was considered for calculation and (ii) only the ground states were taken into account. Moreover, the existing hydrogen bonds and other interactions presented in the complex may also influence the HOMO-LUMO energy gap [42][43][44]. The related frontier orbitals and their energies are given in Fig.…”