Spiral-containing cadmium metal organic framework fluorescent material and preparation method thereof

The invention relates to a spiral-containing cadmium metal organic framework fluorescent material and a preparation method thereof. The material is a self-entangled spiral-containing 1,4-dibenzyl(2-methylbenzimidazole) cadmium metal organic framework of which the chemical formula is {[Zn(bmb)(m-ada)].1.5H2O}n, wherein bmb is 1,4-dibenzyl(2-methylbenzimidazole), and m-ada is 1,3-adamantyl diacetic acid anions. The preparation method comprises the following steps: mixing cadmium nitrate tetrahydrate, 1,4-dibenzyl(2-methylbenzimidazole), 1,3-adamantyl diacetic acid, sodium hydroxide and distilled water to obtain a mixed solution A, transferring the mixed solution A into a teflon-lined stainless steel reaction kettle, keeping the temperature constant at 170 DEG C for three days, and slowly cooling to room temperature at the rate of 5 DEG C/hour to obtain colorless prism crystals; and washing, filtering and drying to obtain the spiral-containing cadmium metal organic framework fluorescent material. The method is s