pH-Dependent two novel heteronuclear Cu(II)/Sr(II) coordination polymers constructed from 1,3,5-benzenetricarboxylic acid: Synthesis, crystal structures and properties

Crystal structure of a heterometallic coordination polymer: poly[diaquabis(μ7-benzene-1,3,5-tricarboxylato)dicalcium(II)copper(II)]

“…As a multifunctional hybrid ligand, H 3 BTC (benzene-1,3,5-tricarboxylic acid) in its partly or fully deprotonated form exhibits versatile coordination modes and can bind to the metal ions by making full use of the carboxylate oxygen atoms. In addition, heterometallic compounds incorporating only the H 3 BTC ligand are few in number (Chen et al, 2004;Li et al, 2010;Sun et al, 2014Sun et al, , 2016Xu et al, 2014). As part of our ongoing studies on these compounds, we describe here synthesis and crystal structure of the title compound, [Ca 2 Cu(BTC) 2 (H 2 O) 2 ] n , (1).…”

“…The title compound was synthesized using a similar procedure to that for the synthesis of the analogous compound [CuSr 2 (BTC) 2 ]Á10H 2 O (Sun et al, 2016). A mixture of H 3 BTC (210 mg, 1 mmol), CuCl 2 Á6H 2 O (121 mg, 0.5 mmol) and CaCl 2 (110 mg, 1 mmol) in 15 mL of distilled water was stirred for 10 min in air; 0.5 M NaOH was then added dropwise, and then the mixture was turned into a Parr Teflon-lined stainless steel vessel and heated to 443 K for 3 d. Blue block-shaped crystals suitable for X-ray diffraction were obtained in 60% yield (based on benzene-1,3,5-tricarboxylic acid).…”

Dependence of the SBU length on the size of metal ions in alkaline earth MOFs derived from a flexible C3-symmetric tricarboxylic acid

“…[28][29][30][31][32][33][34][35][36][37][38][39][40] A few tricarboxylate ligand-based group 2 MOFs have also been reported. For example, 1,3,5-benzenetricarboxyl acid (H 3 BTC), 22,24,[41][42][43] and 1,3,5-tris(4-carboxyphenyl)benzene (H 3 BTB) have been particularly investigated as spacers. [44][45][46][47] It is obvious from the literature examples that the realization of new alkaline-earth metal-based MOFs has mainly focused on rigid ligands.…”

Crystal structure of a heterometallic coordination polymer: catena-poly[[[tetraaquacobalt(II)]-μ-pyridine-2,6-dicarboxylato-calcium(II)-μ-pyridine-2,6-dicarboxylato] dihydrate]

“…The influencing factors include the coordination geometry of the metal centre, reaction of solvent, temperature, metal-to-ligand ratio, pH value, the nature of ligand, and so on (Chen et al, 2012;Guo & Cao, 2009;Ni et al, 2009;Yamada et al, 2011). According to our earlier study (Sun et al, 2016), heterometallic complexes containing both alkaline earth metals and d-block transition metals are available because the former are structurally malleable and they have a strong affinity to O atoms rather than N atoms (Cao et al, 2015;Yu et al, 2013), and the latter have a strong tendency to coordinate to both N-and O-atom donors (Hu et al, 2013;Zhang et al, 2013). Meanwhile, pyridinedicarboxylic acid (H 2 pdc) is widely used in the construction of various metal-organic frameworks for two main reasons.…”