A new complex [Pr3NH]+ [Mn(dca)3]− · H2O (dicyanamide = dca−) was synthesized, in which the Mn2+ cations are bridged by end-to-end dca anions to form three-dimensional [Mn(dca)3]nn− networks and tripropylammonium cations reside in the cavities of these networks. The complex has been characterized by single-crystal X-ray diffraction, infrared spectroscopy, elemental analysis, and magnetic measurements. Magnetic susceptibility data indicate ferromagnetic interactions among the MnII ions.

A new pure organic co-crystal compound 1, [C4H4O4][C8H19N] ([C4H4O4] = maleic acid, [C8H19N] = diisobutylamine/DIBA) was discovered to undergo an above room temperature reversible phase transition at around 353/343 K. The variable-temperature single-crystal X-ray structural measurements reveal that space group of the structural phase transition is from space group Cmm2 to space group Imm2. The phase transition of compound 1 is mainly ascribed to the twisted movement of diisobutylamine molecules. Meanwhile, nonlinear optical (NLO) properties were also observed in compound 1.

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