Charge-transfer complexes of sulfur-rich acceptors derived from birhodanines. Issue 35 (15th July 2019) - Fan, Shuxiang
Abstract : The title acceptors form charge-transfer complexes with mixed stacks, whose transistors are affected by the S–S interaction between the acceptors. Abstract : Sulfur-rich acceptors, birhodanines, 3, 3′-dialkyl-5, 5′-bithiazolidinylidene-2, 2′-dione-4, 4′-dithiones (OS- R, R = Et and Pr) and 3, 3′-dialkyl-5, 5′-bithiazolidinylidene-4, 4′-dione-2, 2′-dithiones (SO- R, R = Et), as well as the sulfur analogues, 3, 3′-dialkyl-5, 5′-bithiazolidinylidene-2, 4, 2′, 4′-tetrathiones (SS- R, R = Et, Pr), form 1 : 1 composition charge-transfer complexes with donors such as pyrene, perylene, and coronene. These complexes have mixed stacks, and theSS- R complexes show n-channel transistor properties due to the intercolumnar S⋯S contacts between the acceptors. By contrast, theOS- R andSO- R complexes exhibit basically hole-dominant ambipolar properties due to the absence of S⋯S contacts. Accordingly, the charge transport is governed mostly by the direct interchain interactions instead of the transport along the columns.