石墨烯量子点自组装制备硅基亚稳态分子间复合物及其放热性能研究

亚稳态分子间复合物因其具有较高的能量密度在军事与民用领域受到广泛应用.本文作者利用石墨烯量子点(graphene quantum dots, GQDs)作为自组装媒介制备Si/GQDs/Fe_2O_3纳米复合物,并研究了所制备复合物的形貌与放热性能,同时讨论了不同分散剂对所制备的复合物形貌与放热量的影响.结果显示,以水/异丙醇混合物作为分散剂并通过GQDs自组装制备的亚稳态分子间复合物放热量达到1 817.5 J/g.对比发现Si与Fe_2O_3纳米颗粒在水/异丙醇混合物中良好的分散性与二者表面通过GQDs构建的紧密接触是实现放热量提高的主要原因.     

Synthesis and Crystal Structure of a Novel Chiral 3D Metal-organic Framework Based on an N-methyl Substituted Salan Ligand

A chiral 3D metal-organic framework [CdL]·DMSO·H2O(1) was constructed by an N-methyl substituted salan ligand(H2L), and characterized by elemental analyses, IR, TGA, powder XRD and single-crystal X-ray crystallography. 1 crystallizes in the chiral hexagonal space group P6522 with a = b = 12.2175(3), c = 51.450(3) , V = 6650.9(4) 3, Z = 6, Mr = 883.45, Dc = 1.323 g·cm–3, F(000) = 2760, λ(CuKα) = 1.54178 , μ = 4.771 mm–1, GOOF = 1.041, R = 0.0313 for 3901 observed reflections with I 2σ(I) and wR = 0.0773. 1 consists of three identical sets of independent 3D frameworks interpenetrated with each other. In each set of such 3D frameworks, one half of the monomer(CdL)1/2 as the building unit forms double antiparrel helical chains which are further bridged together by other(CdL)1/2 units from adjacent helical chains. All CdL units in 1 adopt Δ geometry. DMSO and water guest molecules are found in the gap of the interpenetrated frameworks.