Reactions of sulfenyl- and selenylchlorides of boron difluoride acetylacetonate with C-H acids

Zero-, one-, two- and three-dimensional supramolecular architectures sustained by Se…O chalcogen bonding: A crystallographic survey

“…The chemical diagrams of the mono-nuclear selenium(II) molecules, i.e. 107 – 123 [152] , [163] , [164] , [165] , [166] , [167] , [168] , [169] , [170] , [171] , [172] , [173] , [174] , [175] , [176] , [177] and 124 – 126 [159] , [178] , [179] , forming, respectively, helical and twisted supramolecular chains in their crystals based on Se … O chalcogen bonding contacts are shown in Fig. 10 .…”

“…The supramolecular chains with helical symmetry are typically propagated by crystallographic 2 1 screw symmetry, with two exceptions only, and, while less numerous than zig-zag supramolecular chains sustained by Se … O interactions, comprise 17 examples. Six of the molecules do not have selenium incorporated within a ring, and four of these have selenium within a C 2 -donor set: 107 [163] , 108 [164] , 109 [165] , Fig. 10 a, and 110 [166] , and two of the examples are selenides 111 [167] and 112 [168] , Fig.…”