Series of charge transfer complexes obtained as crystals in a confined environment. Issue 36 (26th August 2021)

• Record Type: Journal Article
• Authors: Sanda Bawa, Ali; Meunier-Prest, Rita; Rousselin, Yoann; Couvercelle, Jean-Pierre; Stern, Christine; Malézieux, Bernard; Bouvet, Marcel
• Is Part Of: CrystEngComm. Volume 23:Issue 36(2021)
• Page Start: 6418
• Page End: 6426
• Publication Date: 2021-08-26
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d1ce00929j
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : A series of charge transfer complexes (CTCs) were successfully formed by solvent free processing techniques, using the 1, 2, 4, 5-tetracyano benzene (TCNB) as πA molecule and a series of p -dihydroquinones (H2 Qs) as πD counterparts. Abstract : A series of charge transfer complexes (CTCs) were successfully formed by solvent free processing techniques, using the 1, 2, 4, 5-tetracyano benzene (TCNB) as πA molecule and a series of p -dihydroquinones (H2 Qs) as πD counterparts. Additionally to the classical co-evaporation techniques, we obtained CTCs in less than an hour, in a very simple confined environment, between two 100 μm – spaced glass plates. A systematical study by Raman spectroscopy on crystals highlighted the CTCs formation. Moreover, three new crystalline structures were obtained, namely TCNB-H2 Q that crystallizes in columns connected to each other by H-bonds, while with the methoxy- and dimethoxy-H2 Qs the CTC forms crystals with the stoichiometry 1 : 2, TCNB-(H2 QOMe )2 and TCNB-(H2 QOMe2 )2 . In TCNB-(H2 QOMe )2 layers are formed due to intermolecular hydrogen bonds, while in TCNB-(H2 QOMe2 )2 molecules arrange in triads, with πA –πD interactions. In all cases, strong πA –πD interactions exist with intermolecular distances lower than the van der Waals distances, which results in strong absorption bands in the visible range.