Formation of [CuSCN]_n-Based Topological Structures via a Family of Flexible Benzimidazolyl-Based Linkers with Different Spacer Lengths

Abstract

Solvothermal reactions of bulk CuSCN with six flexible benzimidazolyl-based ligands with different spacer lengths [(bzim)(CH 2 ) n (bzim)] (bzim = benzimidazolyl; n = 1, mbbm; n = 2, ebbm; n = 3, prbbm; n = 4, bbbm; n = 5, pbbm; n = 6, hbbm) afforded a series of new [CuSCN] n -supported coordination polymers, [(CuSCN) 2 5), and [(CuSCN) 2 (hbbm)] n (6), respectively. Compounds 1-6 were characterized by elemental analysis, IR, and X-ray crystallography. Compound 1, 3a, or 6 possesses the similar staircase-like [CuSCN] n chains that are bridged by mbbm, prbbm, or hbbm to form one one-dimensional (1D) chain with an oblong channel (3a) or two two-dimensional (2D) networks (1 and 6). Compound 2 or 3b consists of a dimeric [CuSCN] 2 fragment that serves either as a 4-connecting node to link the other four equivalent ones via two pairs of ebbm bridges to form a 2D (4,4) network (2) or as a 2-connecting node to bridge its two adjacent ones via a pair of prbbm bridges to form a 1D chain (3b). Compound 4 contains a new kind of [CuSCN] n double chain that is connected by bbbm with two conformations to form a unique 2D network, while 5 consists of a [CuSCN] n single chain that is linked by pbbm to form the other kind of 1D chain with an oblong channel. In addition, the photoluminescent properties of 1-6 in solid state at ambient temperature were also investigated.

Crystal structure of poly-[(μ2-((1,3-bis(benzimidazol-1-yl)propane-κ2 N:N′)(μ2-4-tert-butyl-phthalato-κ2 O:O′)cobalt(II)] monohydrate, C29H30CoN4O5

“…We have explored the structural transformation mediated by 4-R-phthalic acid (R = −C(CH 3 ) 3 or −CH 3 ) and N-donor ligands [8]. Among diimine-type N-donor co-ligands, 1,3-bis(benzimidazol-1-yl)propane (bbip) is a flexible ligand, with the potential to serve as bridging ligand, which are employed to construct new CPs [9][10][11]. It is also employed to assemble supramolecular architectures via π-π-aromatic interactions with other organic ligands [12].…”

Cobalt (II) coordination polymers based on 3,5-dinitrobenzoate and flexible bis(benzimidazole) derivatives bearing different spacer lengths and substituents

“…Multidentate N-heterocyclic ligands, especially those containing flexible spacers, have been widely used in these systems, and many complexes with novel architectures have been obtained [11][12][13][14]. Some complexes with flexible N-heterocyclic ligands such as 1,3-bis(4-pyridyl)-propane (bpp), 1,4-bis(imdazol-1-ylmethyl)benzene (bix), 1,3,5-tri(imidazol-1-ylmethyl)benzene (tib), and 1,1 0 -(1,4-butanediyl)bis-1H-benzotriazole (bbbt) have been reported by Lang, Bu, Ma and our group [15][16][17][18][19].…”

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

“…Among these compounds, the transition metal complexes anion (based on the thiocyanate or isothiocyanate ligand) attracts much interest as these ions may coordinate either through the N or S atom as a monodentate ligand, or though N and S atoms as a bridging ligand, forming some complexes with one-, two-or three-dimensional networks [4,[8][9][10]. In particular, the inherent coordination angle of the isothiocyanate species leads to a wide range of various molecular solids containing [M(NCS) 4 ] 2− (M = Mn 2+ , Co 2+ , Zn 2+ ), which may exhibit interesting magnetic behaviors, electronic, and optical properties [11][12][13][14][15]. The selection of the counter organic cation is of key importance as it controls the stacking of the whole molecule, and the non-covalent interactions (such as weak p···π/π···π stacking interactions and hydrogen bonds) also play an important role in the arrangement of the structural units of molecular solids [16][17][18].…”