Pre-organisation or a hydrogen bonding mismatch: silver(I) diamide ligand coordination polymers versus discrete metallo-macrocyclic assemblies

Abstract

Pre-organisation or a hydrogen bonding mismatch; silver(I) diamide ligand coordination polymers versus discrete metallo-macrocyclic assemblies, Supramolecular Chemistry, 2012; 24(8) Retained rights the right to post on a non-commercial basis your "Author's Accepted Manuscript" (i.e., your manuscript in the form accepted for publication, revised after peer review; formerly a "postprint"), as a digital file on your own website for personal or professional use, or on your institution's network or intranet or website, or in a subject repository that does not offer content for commercial sale or for any systematic external distribution by a third party, provided that you do not use the PDF version of the article prepared by us and that you include any amendments or deletions or warnings relating to the article issued or published by us; in compliance with the embargo periods detailed below; and only with this acknowledgement:

Synthesis, Crystal Structure and Coordination Chemistry of Di-2-Pyridylmethaneammine-Based Chelating Ligands With Cadmium Salts

“…The Cd-N bond lengths are in the range 2.318(5) -2.371(5)Å which are similar to many previous literature studies [15][16][17][18][19][20]. This complex has two cadmium atoms with trigonal bipyramidal geometries, although the cadmium atoms have quite different donor sets.…”

“…By contrast to complexes of L1, the chelating rings in this complex is twisted by ca. 63.3° from the plane of the central phenyl core, which is approximately three times greater than the torsion angles observed in previous complexes reported by us [17]. Due to the para substitution of the central arene core, complex of L2 have a considerably longer Cd-Cd distance (12.261 Å) than those observed in complex of L1.…”

“…Cd (1) is coordinated by two nitrogen atoms from the pendant pyridyl rings of L1, two chloride atoms (one bridging and one monodentate), while the second cadmium atom Cd (2) is coordinated by two nitrogen atoms from the pyridyl rings of L1, two chloride atoms and one methanol molecule. In similar manner to related ligands, [17] ligand L1 uses all four nitrogen donors to coordinate with the cadmium atoms. The distance between Cd1-Cd2 is 6.40 Å, while the distance between the two cadmium atoms bridged by the chloride anions is much shorter at 3.68 Å.…”

“…The coordination mode of L1 in this complex has quite a different motif compared with complexes incorporating other ligands based on a 1,3-phenyl core, such as 1,3-bis(di-2-pyridylaminomethyl)benzene [2]. In previous work, reaction of this ligand with silver nitrate gave discrete [1+1] metallo-macrocycle complex, while reaction with silver perchlorate and silver hexafluorophosphate gave 1-D coordination polymers [17]. The previous study revealed that ligand 1,3-bis(di-2-pyridylaminomethyl)benzene acted as a divergent bridging unit, with only two of the four pyridine rings involved in the coordination to form the complexes.…”

Synthesis, Characterization and Crystal Structure of Coordination Polymers Developed as Anion Receptor

“…The cadmium is coordinated by four pendant pyridyl groups and two water molecules. The bond lengths for the Cd-N bonds are in the range 2.318( 14 [28][29]. This coordination polymer displayed cavities occupied with nitrate anions, and some cavities are empty (Figure 1(b)).…”