Role of the Auxiliary Ligand in the Spontaneous Resolution of Enantiomers in Three-Dimensional Coordination Polymers

Four pairs of chiral 3D coordination polymers (CPs), [Zn₂(BDC)(lac)(DMF)]·guest (2) (H₂BDC = benzene dicarboxylic acid; H₂lac = lactic acid; guest = 1.5DMF + i-PrOH), [Co₂(BDC)(lac)(DMF)]·guest (3) (guest = DMF + 2H₂O), [Fe₄(BDC)₃(lac)₂(DMF)₂](CO₃)·guest (4) (guest = DMF + 2H₂O), and {Zn₁₁(BPDC)₆(lac)₆[NH₂(CH₃)₂]₂}·guest (H₂BPDC = 3,3'-biphenyldicarboxylic acid; guest = 6DMF + 18H₂O) (5), are prepared through the reactions of racemic lactic acid (rac-H₂lac) with different metal ions and auxiliary ligands. Structural analyses and DFT calculations reveal that forming more and stronger coordination bonds between the auxiliary ligand and metal ions is more conducive to the spontaneous resolution of enantiomers in 3D CPs than simply increasing the entropy of the auxiliary ligand itself.

The first amorphous and crystalline yttrium lactate: synthesis and structural features

The synthesis and crystal structure of the first molecular yttrium lactate complex, Y(Lac)₃(H₂O)₂, is reported, where the coordination sphere of yttrium is saturated with lactate ligands and water molecules, resulting in a neutral moiety. In Y(Lac)₃(H₂O)₂, hydrogen bonding between α-hydroxy groups and water molecules allows for the formation of 2D layers. A subtle variation in synthetic conditions, i.e. a slight increase in pH (5.5 instead of 4.5) promoted the formation of a semi-amorphous fibrous material with a presumed chemical composition of Y₄(OH)₅(C₃H₅O₃)₇·6H₂O. The flattened fibres in this material are responsible for its good flexibility and foldability.

The synthesis and crystal structure of the first molecular yttrium lactate complex, Y(Lac)₃(H₂O)₂, is reported, where the coordination sphere of yttrium is saturated with lactate ligands and water molecules, resulting in a neutral moiety.

Ln-Ag heterometallic coordination polymers

The last few years have seen an increasing interest in the study of lanthanide-silver (Ln-Ag) heterometallic coordination polymers due to their potential applications. It has led to intense activity of chemists to produce Ln-Ag heterometallic coordination polymers and investigate their properties. In this review, we summarize recent research development in the fascinating and challenging field of Ln-Ag heterometallic coordination polymers. This review covers 182 Ln-Ag heterometallic coordination polymers, which are categorized by the kind of ligand as N-heterocyclic carboxylate ligands and others. There are three categories of Ln-Ag coordination polymer based on N-heterocyclic carboxylate ligands: one dimensional (1D), 2D, and 3D. The 3D part was divided into Ln-Ag coordination polymers based on pyridine carboxylate ligands and other N-heterocyclic carboxylate ligands. This perspective illustrates the coordination features of compounds constructed by N-heterocyclic carboxylate ligands. Luminescent properties are also discussed.

Lanthanide coordination polymers constructed from 5-(1H-tetrazol-5-yl)isophthalic acid ligand: white light emission and color tuning

A series of lanthanide coordination polymers (LnCPs), namely [Ln(TZI) (H₂O)₅]_n(1–5) [Ln = Nd (1), Eu (2), Gd (3), Tb (4) and Sm (5)], were synthesized through the self-assembly of 5-(1H-tetrazol-5-yl)isophthalic acid (H₃TZI) ligand and lanthanide ions.

Three sra topological lanthanide–organic frameworks built from 2,2′-dimethoxy-4,4′-biphenyldicarboxylic acid

The first neutral 3D sra-LOF built from a 1D inorganic rod-shaped chain [Ln(CO₂)₂(HCO₂)]_n (Ln = Eu, Gd, Dy) was synthesized.