Two solvent and temperature dependent copper(ii) compounds formed by a flexible ligand: syntheses, structures and SC–SC transformation

Abstract

A nonporous neutral framework [CuCl(2)(m-bttmb)(2)](n) (1) was changed into a porous ionic {[Cu(m-bttmb)(2)(H(2)O)Cl]Cl(CH(3)CN)(0.5)(H(2)O)(2.75)}(n) (2) by simply increasing the amount of CH(3)CN in the mixed solvent (CH(3)CN and H(2)O) or temperature in the reactions of CuCl(2)·2H(2)O with 1,3-bis(triazol-1-ylmethyl)-2,4,6-trimethylbenzene (m-bttmb). 1 undergoes transformation into 2 when treated with CH(3)CN. Both 1 and 2 have 2D 4-connected (4,4) network architectures but in different packing arrangements. These compounds have been characterized by single-crystal X-ray diffraction analysis, elemental analysis, IR spectra and thermogravimetric analysis. This work may provide a way to control the formation of neutral or ionic frameworks, as well as porosities by adjusting the polarity and components of the solvents.

Production of Diethyl Terephthalate from Biomass‐Derived Muconic Acid

“…Atom Cu1 is displaced out of this basal plane toward O w site by 0.144(4) Å. The bond lengths of Cu1–O w (2.290(4) Å] is typical for the Cu–O complexes,25 while those of Cu–N [Cu1–N1, 2.039(4) Å; Cu1–N2, 1.940(4) Å; Cu1–N3, 1.962(4) Å; Cu1–N4, 2.052(4) Å] are also in the normal range 26,27. It is noteworthy that the conformation of the dinuclear copper(II) atoms, two ligands and two coordinated water represents the centrosymmetry, resulting in the uniform coordination environment for each copper(II) atoms.…”

(M3L4 + M2L4): a unique example of a co-crystal containing M3L4 and M2L4 metallocages

“…The flexible ditopic ligand bitmb was prepared according to the literature method. 10 C, H and N elemental analyses were performed using a Perkin-Elmer 240C elemental analyzer at the analysis center of Nanjing University. Infrared (IR) spectra were obtained with a Nicolet FT-IR 170SX spectrophotometer using KBr disks.…”

Transformation of One-Dimensional Ladders into Two-Dimensional Networks via Simple Solvate Exchange in Single-Crystal-to-Single-Crystal Mode

“…Studies on self-assembly and related synthetic methodologies have provided information useful to the structural control and development of metal–ligand framework materials. − Tuning of supramolecular isomers, a challenging issue, can aid fundamental understanding and facilitate development of functional molecular coordination materials. − Such an efficient methodology for construction of desirable molecular coordination materials from building blocks is a hot topic and has already yielded exciting advances in various task-specific practical functionalities such as photoelectronic devices, ion exchangers, desiccants, molecular sieves, sensors, catalysts, negative Poisson’s ratio materials, guest-preorganizers, and state-transition materials. − Generally, self-assembly of metal ions with designed organic ligands gives rise to serendipitous products containing supramolecular isomers − owing to the intrinsic presence of unusually weak interactions − and reaction conditions related to solvent, temperature, pH, photoenergy, and the crystallization method. − As for the diverse supramolecular isomers possibly obtainable from identical building blocks, research into selective product formation is keenly required and can provide a good opportunity for investigation of the detailed structure–property relationships of functional coordination polymers. − …”