[C(NH₂)₃]₂S₂O₈: combining delocalized and localized π-conjugate units to achieve strong optical anisotropy

Abstract

A new birefringent crystal [C(NH2)3]2S2O8 was obtained by combining the π-conjugated [C(NH2)3] cation and the [S2O8] groups with localized O-O πbonds. Optical measurements show that the UV cutoff wavelength of...

Enhancement of Birefringence in π-Conjugated Oxyfluorides Achieved via van der Waals Layered Structural Optimization

“…It is noteworthy that the birefringence of Gu 3 V 2 O 4 F 5 surpasses that of most reported guanidine-based salts (Table S9), including [C-(NH 2 ) 3 ] 2 HPO 4 •H 2 O (0.014@532 nm), 70 [C(NH 2 ) 3 ] 3 PO 4 • 2H 2 O (0.055@546 nm), 71 [C(NH 2 ) 3 ] 2 SO 3 S (0.073@546 nm), 72 C(NH 2 ) 3 ClO 4 (0.076@1064 nm), 73 and [C-(NH 2 ) 3 ] 2 S 2 O 8 (0.081@546 nm). 74 In order to explore the contributions of different groups in Gu 3 V 2 O 4 F 5 and GA 2 VOF 5 to their birefringence, a real-space atom-cutting technique was employed, 62 and the calculated results are shown in Table S10. It is evident that the primary contributions originate from the [C(NH 2…”

Na10Zn(NO3)4(SO3S)4: a nonlinear optical crystal combining inorganic π-conjugated and non-π-conjugated heteroanion groups

“…Recently, several novel compounds with partial sulfur-substituted groups have been discovered, such as Na 3 PO 3 S, 38 Na 10 Cd(NO 3 ) 4 (SO 3 S) 4 , 39 (C(NH 2 ) 3 )SO 3 S, 40 and [C(NH 2 ) 3 ] 2 S 2 O 8 . 41 These new partially substituted non-π-conjugated groups exhibit enhanced microscopic properties compared to normal oxygen tetrahedral units (MO 4 , where M = B, P, S, Si, etc . ).…”