Non-classical hydrogen bonds (C–H⋯X, X=Cl and N) induced 3D architecture: Trigonal bipyramidal ferric complex, [Fe(btp)Cl3]n (btp=2,6-bis(N1-1,2,4-triazolyl)pyridine)

Crystal structures of μ-oxalato-bis[azido(histamine)copper(II)] and μ-oxalato-bis[(dicyanamido)(histamine)copper(II)]

“…The geometrical features of these weak hydrogen bonds exhibit a wide range of variation depending on the strength of the donors and acceptors. The values of the bond lengths and angles for the two title compounds in this study are within the typical range for C-HÁ Á ÁX (X = N, O) hydrogen bonds (Mascal, 1998;Sigel et al, 1998;Janiak & Scharmann, 2003;Youm et al, 2006).…”

Locking the free-rotation of a prochiral star-shaped guest molecule inside a two-dimensional nanoporous network by introduction of chlorine atoms

“…These values fall in the range of values reported previously (distance below the sum of van der Waals radii (2.95 A ˚) and angles larger than 1301). 18 The second TrisK-3Cl network (upper part of Fig. 2a) consists in a filled honeycomb arrangement (a = b = 29 A ˚; g = 601y) similar to that of TrisK-3H.…”

Hexakis(dimethyl sulfoxide-κO)zinc(II) polyiodide

“…For related structures, see Garzó n-Tovar et al (2013); Long et al (1999); Tkachev et al (1994). For supramolecular polymers formed by non-classical hydrogen bonds, see: Fromm (2001); Huang & Scherman (2012); Youm et al (2006). For polyiodide compounds, see: Svensson & Kloo (2003).…”

“…defined as polymeric systems that extend beyond the molecule by a process of selfassembly between monomer units directed by noncovalent interactions(Huang & Scherman, 2012). These noncovalent forces, such as hydrogen bonding, coordination bonds, π-π stacking and electrostatic forces act as driving forces to construct a well defined supramolecular architectures(Fromm, 2001); however, there are a few examples where nonclassical hydrogen bonds such as C-H•••I are used to construct these structures(Youm et al, 2006). Previous studies have suggested that a coordination complex with DMSO such as [Cu(DMSO) 6 ] 2+ acts as monomeric units connected through a self-assembly process with tetraiodide ions driven by weak non-classical hydrogen bonds C-H•••I to form a one-dimensional supramolecular polymer(Garzón-Tovar et al, 2013).…”