Structural and spectral characterization of a new non-centrosymmetric organic thiosulfate

Tuning the optical isotropic point of mixed crystals of ethylenediammonium sulfate/selenate

“…Ethylenediammonium forms isomorphous P4 1 2 1 2 crystals with SO 4 2À , SeO 4 2À and BeF 4 2À , and P2 1 2 1 2 isostructural crystals with a variety of other anions (Srinivasan et al, 2013;Nichols et al, 2016;Martin et al, 2017a). Anion substitution in EDSe may lead to a family of isostructural crystals and mixed crystals with physical properties that can be tailored.…”

“…Ethylenediammonium is a flexible cation that has been characterized in salts of more than 40 anions, many of which are isostructural and some of which are isomorphous with one another (Srinivasan et al, 2013). Recent research has employed Mueller matrix polarimetry with variable coherence optical models (Postava et al, 2002;Nichols et al, 2015;Martin et al, 2017b;Nichols, 2018;Arteaga & Kahr, 2019) to establish the linear birefringence (LB) and circular birefringence (CB) anisotropies in isomorphous crystals [space groups P4 1(3) 2 1 2] of ethylenediammonium sulfate (EDS) (Nichols et al, 2016) and ethylenediammonium selenate (EDSe) (Martin et al, 2017a).…”

Chiral and achiral crystals, charge-assisted hydrogen-bond patterns and self-organization of selected solid diaminium thiosulfates

“…It has been reported that ethylenediaminium thiosulfate also crystallized in the Sohncke space group (Srinivasan et al, 2013). Although H 3 NC 2 H 4 NH 3 S 2 O 3 does not contain any stereogenic centre and both the unique ethylenediaminium cations adopt an anti conformation, it forms chiral crystals and as such exhibits the second harmonic generation (SHG) property appearing as a green light emission generated from a beam of IR.…”

“…Examination of their structure reveals important details regarding self-assembly in the solid state, hydrogen-bonding network topology and, additionally in some cases, shows that the crystals lack inversion centres and as such give non-centrosymmetric physical properties (e.g. generation of second harmonic wave or piezoelectricity; Srinivasan et al, 2013). The hydrogen bonding plays a crucial role here in structure formation as it is enhanced by electric charges on both donor and acceptor groups and thus is energetically preferred.…”

“…Alkyldiaminium thiosulfates are potentially interesting compounds because of the possibility to investigate the influence of the length and shape of the hydrocarbon chain on the structures. Until now, only two structures of alkyldiaminium thiosulfates have been published: ethylenediaminium thiosulfate {(H 3 NC 2 H 4 NH 3 ) 2+ , S 2 O 3 2À } (Srinivasan et al, 2013) Chojnacki, 2014). Herein, we present preparation and structural analysis for new members of this class of compounds: 1,2-propylenediaminium thiosulfate [structures (1a) and (1b)], 1,3-propylenediaminium thiosulfate (2), 1,4-butylenediaminium thiosulfate (3), 1,5-pentylenediaminium thiosulfate (4) and 1,6-hexylenediaminium thiosulfate (5) (Scheme 1).…”