Crystal-to-crystal transformation and linker exchange in Cd(ii) coordination polymers based on flexible bis-pyridyl-bis-amide and 1,4-naphthalenedicarboxylate

Abstract

Solvothermal reactions of Cd(ii) salts and naphthalene-1,4-dicarboxylic acid with bis(N-pyrid-3-ylmethyl)adipoamide and bis(N-pyrid-3-ylmethyl)suberoamide yield three Cd(ii) coordination polymers that undergo reversible crystal-to-crystal transformation and linker exchange.

Structural conversion of three copper(ii) complexes with snapshot observations based on the different crystal colours and morphology

“…The structural transformation of complexes can lead to different properties, such as colour, morphology, adsorption, chirality, luminescence and magnetism. [1][2][3][4][5][6][7][8][9][10][11][12][13] The potential application value brought by the diversity of complex structures has attracted more and more attention. 14 The structural transformation is usually characterized by small changes in the number and order of uncoordinated molecules at the molecular level, such as the addition and removal of solvents or guest molecules.…”

Nickel(II) Coordination Polymers Supported by Bis-pyridyl-bis-amide and Angular Dicarboxylate Ligands: Role of Ligand Flexibility in Iodine Adsorption

“…Noticeably, the L 1 , L 2 , and L 3 ligands in 1 – 8 bridge two metal ions through two pyridyl nitrogen atoms, while the L 3 ligand of 9 bridges four metal ions through two pyridyl nitrogen atoms and two amide oxygen atoms. The bpba ligands that bridge four metal ions are rare and can be found for the bis(N-pyrid-3-ylmethyl)suberoamide (L) in {[Cd(L)(1,4-NDC)]·2H 2 O} n (1,4-H 2 NDC = naphthalene-1,4-dicarboxylic acid) and {[Cd 2 (L)(1,4-NDC) 2 ]·3H 2 O} n [ 15 ].…”

Structural Transformations of Cobalt(II) Coordination Polymers Constructed from N,N′-Di-3-pyridyladipoamide and Tetracarboxylic Acids: Disentanglement upon Water Coordination

“…Polycarboxylate ligands that show diverse coordination modes involving chelating and bridging are important in the organization of CPs in a mixed system . We have been committing to the design and synthesis of bis-pyridyl-bis-amide (bpba)-based CPs, and several of them thus prepared with , or without − the involvement of dicarboxylate ligands exhibited structural transformations. We have shown that CPs composed of N , N ′-di-3-pyridylsuberoamide and 1,4-naphthalenedicarboxylate (1,4-NDC 2– ) exhibit irreversible structural transformation due to the weak coordination ability of the ethanol molecule and the variation of bonding modes of the 1,4-NDC 2– ligands, while reorientation of amide oxygen atoms was proposed for the reversible structural transformations in the CPs containing bis­( N -pyrid-3-ylmethyl)­suberoamide and 1,4-NDC 2– …”

“…We have shown that CPs composed of N,N′-di-3-pyridylsuberoamide and 1,4naphthalenedicarboxylate (1,4-NDC 2− ) exhibit irreversible structural transformation due to the weak coordination ability of the ethanol molecule and the variation of bonding modes of the 1,4-NDC 2− ligands, 13 while reorientation of amide oxygen atoms was proposed for the reversible structural transformations in the CPs containing bis(N-pyrid-3-ylmethyl)suberoamide and 1,4-NDC 2− . 14 The tetracarboxylic acids that may display variable coordination modes have been widely used to prepare diverse CPs. 20−23 Therefore, the tetracarboxylate ligands are capable for the building of multidimensional architectures, and a variety of coordination modes adopted by the tetracarboxylate may govern the possible structural transformations among the CPs thus prepared.…”