Synthesis of substituted benzo[b]selenophenes

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

“…There are a total of 32 selenium(II) species, 1 – 32 [11] , [73] , [74] , [75] , [76] , [77] , [78] , [79] , [80] , [81] , [82] , [83] , [84] , [85] , [86] , [87] , [88] , [89] , [90] , [91] , [92] , [93] , [94] , [95] , [96] , [98] , [99] , [100] , [101] , forming Se … O contacts leading to zero-dimensional aggregates. The chemical diagrams for the interacting species in these structures are shown in Fig.…”

“…The overwhelming majority of mono-nuclear selenium(II) molecules in this category adopt a two-molecule motif sustained by two Se … O contacts. This motif is found in the crystals of 10 – 27 [81] , [82] , [83] , [84] , [85] , [86] , [87] , [88] , [89] , [90] , [91] , [92] , [93] , [94] , [95] , [96] . Molecules 10 – 12 feature acyclic, two-coordinated selenium, 13 is a selenide and those of 14 – 27 are also two-coordinated but with the selenium atom incorporated within a ring.…”

“…The ring-selenium atoms are generally incorporated within five-membered rings but form part of a six membered ring in 27 [96] and part of an eight-membered ring in 18 [89] . The molecules in 14 [85] , 16 [87] and 27 [96] , the latter having potential sulphoxide-oxygen atoms capable of forming Se … O contacts, Fig. 3 h, associate via Se … O(carbonyl) contacts.…”