Halogen Bonding in Crystal Engineering - Halogen Bonding: Fundamentals and Applications - page 120

Fig. 8 Herringbone 1D infinite chains formed on self-assembly of bidentate donor and ac-
ceptor modules wherein acceptor sites axes are parallel and coaxial and donor sites axes
are angled
axes in starting modules. For instance, this happens when a linear module
interacts with an angled partner, as is the case of 4,4 -BPY interacting with
1,3-DBTFB (angle 120 ◦ ), 1,2-DBTFB (angle 60 ◦ ) [49] or the corresponding
diiodo analogues [169, 170]) (Fig. 8).
Zig-zag chains are also obtained starting from many other neutral
tectons wherein the donor and/or acceptor sites have an angled geom-
etry,e.g.( Z )-diazaalkenes [171] 2 , phosphine oxides [79], carbonyl [150],
phosphoramidyl [124, 139], and sulfinyl [151] sites, tetrahedral molecules
that work as bidentate modules (e.g. the adducts CBr 4 /DABCO [172],
2 A.L. Spek, private communication, CCDC structure reference code FEGYAR01