Synthesis, crystal structures and vapor adsorption properties of mercury(II) coordination polymers derived from two dipyridylamide ligands

Abstract

Two complexes, [HgL 1 Cl 2 ] n (1) and [Hg 2 (L 2) 2 Cl 4 ] n (2), have been synthesized and characterized from two dipyridylamide ligands (L 1 and L 2) with mercury(II) chloride, respectively. The two complexes exist as 1D coordination polymers but exhibit different architectures with slightly adjusted 3-and 4-position of nitrogen atom in the pyridyl rings from the two ligands. In complex 1, the mercury(II) center is four-coordinated with distorted tetrahedral geometry in 1D-chain structures. In complex 2, the mercury(II) center is five-coordinated with distorted square pyramidal geometry in the 1D-looped structures. The thermal stabilities and vapor adsorption properties of the two complexes were investigated as well.

Modular enhancement of circularly polarized luminescence in Pd2A2B2 heteroleptic cages

“…[43][44][45] Both ligands A and enantiomerically pure R,R-B (from now on just B) are obtained in a one-step reaction from commercially available reagents, following literature-reported procedures. [46][47][48][49] These simple building blocks are then combined with [Pd(MeCN) 4 ](BF 4 ) 2 in acetonitrile in a 1 : 1 : 1 ratio, yielding a rather structurally complex heteroleptic cage [Pd 2 A 2 B 2 ](BF 4 ) 4 (namely Pd 2 A 2 B 2 ; Scheme 1b). The assembly forms virtually quantitatively, requires no purification and its structure was confirmed by a number of analytical results, including 1 H-NMR, where we observe a typical downfield shift of protons H a and H 1 of the pyridine donors of A and B, respectively (Fig.…”