Eclipsed conformers of oligosilane derivatives by intramolecular hypercoordination

Electronic Transitions in Conformationally Controlled Peralkylated Hexasilanes

“…The theoretical understanding of n-tetrasilanes, the shortest chains that exhibit conformational isomerism, is now well advanced. Computationals tudies have been published for the ladderCandHm odels, [33][34][35][36][37] including conformational analysis, [28,29,[38][39][40][41][42] for the excited states of the n-tetrasilanes Si 4 H 10 [43][44][45] and n-Si 4 Me 10 , [9,34,[46][47][48] and for longer chains. [33] Experimental studies have dealt with matrix isolation of n-Si 4 Me 10 conformers; [46,49] conformational control by cyclic carbosilanes, [6,8,[49][50][51][52] bicyclic disilanes, [32,[52][53][54][55][56] bicyclic trisilanes, [57,58] and bulky lateral substituents; [59] hypervalent silicons; [60][61][62][63] helicity introduction by chiral terminal [64][65][66] or lateral [67,...…”

Electronic Transitions in Conformationally Controlled Tetrasilanes with a Wide Range of SiSiSiSi Dihedral Angles

“…Much effort has been devoted to the investigation of these conformational effects in chains of various lengths. These studies have been both computational (ladder C model,33–36 conformational analysis,27, 28, 37–41 excited state calculations on n ‐Si 4 H 10 ,42–44 n ‐Si 4 Me 10 ( 10) ,33, 45–47 and longer chains32) and experimental (matrix isolation of n ‐Si 4 Me 10 conformers,45, 48 conformational control based on cyclic carbosilanes,6, 8, 48–51 bicyclic disilanes,31, 51–55 bicyclic trisilane,56, 57 and bulky lateral substituents,58 hypervalent silicon,59–62 helicity induction by chiral terminal63–65 or lateral66, 67 substituents, and inclusion into cyclodextrin and other hosts68–73).…”