Staging Bonding between Group 12 Metal Ions and Neutral Selenium Donors: Intermolecular Interactions of Mixed N,Se Donor Ligands and Anions

Abstract

The versatile pyridyl synthons of mixed N,Se donor ligands bis(pyridin-2-ylmethyl)selane (L) and 1,2bis(pyridin-2-ylmethyl)diselane (L*) served the dual roles of metal chelating anchors and mediators of supramolecular associations in a crystallographic approach to documenting uncommon bonding between divalent Group 12 metal ions and neutral selenium functionalities. Five new molecular species with diverse ligand configurations and conformations were structurally characterized. Two macrocyclic polymorphs of [ZnLCl 2 ] have intermolecular Se−Cl interactions rather than the desired intramolecular Zn−Se binding. Rare examples of Cd(II)-selenoether bonding are provided by tricoordinate L in dinuclear [CdLCl(μ-Cl)] 2 and mononuclear [CdL(μ-NO 3 ) 2 ]. Unique intramolecular Zn-selenoether and Cd-diselenide bonds are reported for [ZnL(μ-NO 3 ) 2 ] and [CdL*(μ-NO 3 ) 2 ], respectively. In addition, a cocrystal of [CdL(μ-NO 3 ) 2 ] and [CdL*(μ-NO 3 ) 2 ] is structurally characterized. The intermolecular pyridyl π-interactions observed in these diverse structures are highlighted.

Self-Assembly by Tridentate or Bidentate Ligand: Synthesis and Vapor Adsorption Properties of Cu(II), Zn(II), Hg(II) and Cd(II) Complexes Derived from a Bis(pyridylhydrazone) Compound

“…The N–Zn–Cl bond angles are in the range of 104.46(8)°~108.21(9)°. The bond angles for Cl1–Zn–Cl2 and N1–Zn–N6a are 123.80(5)° and 104.21(12)°, respectively, which are consistent with those found in the similar complexes [ 37 ]. The dihedral angles between the pyridyl and the central benzene ring, and the neighboring pyridyl ring are 30.45° and 76.48°, respectively.…”

“…Each Zn(II) is four-coordinated by two Cl anions and two pyridyl nitrogen atoms with a slightly distorted tetrahedral geometry deduced by its structural parameter τ4 = 0.91 (τ4 = 0 for a perfectly a square-planar geometry, and τ4 = 1 for a perfectly tetrahedral geometry) [36]. The Zn1-N1, Zn1-N6a, Zn1-Cl1 and Zn1-Cl2 bond lengths are 2.079 3 12°, respectively, which are consistent with those found in the similar complexes [37]. The dihedral angles between the pyridyl and the central benzene ring, and the neighboring pyridyl ring are 30.45° and 76.48°, respectively.…”

Enhancing polyimide's water barrier properties through addition of functionalized graphene oxide

“…Wide angle X-Ray diffraction data were collected on a Bruker SMART Apex II three circle diffractometer system with graphite monochromator, Cu Kα fine-focus sealed tube (λ = 1.54178 Å) and CCD collector using φ and ω scans [36].…”

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

“…The bond angles for Cl1À HgÀ Cl1b and N1À HgÀ N1b are 153.80(8)°and 97.9(1)°respectively, which are consistent with those found in similar complexes. [29] The ligands are bridged by the Hg(II) centers to form 1D zigzag chains running along the a axis with a pitch of 15.866 Å (Figure 2b). In the extended structure of complex 1, a 2D supramolecular network along the ab plane is formed by NÀ H•••O hydrogen bonds.…”