A new dinucleating 24-membered hexaazadiphenol macrocyclic ligand, 3,6,9,17,20,23-hexaaza-29,30-dihydroxy-13,27-dimethyl tricyclo［23,3,1,111，15］triaconta-1(28),11,13,15(30),25,26-hexaene(BDBPH), was synthesized by the NaBH4 reduction of the Schiff base obtained from the ［2+2］ condensation between diethylenetriamine and diformyl-p-cresol. The crystal structure of the hexahydrobromide salt of BDBPH, BDBPH*6HBr*4H2O, was determined by single crystal X-ray diffractometry. It crystallized in the monoclinic system, space group P21/c, with a=1.444 1(5) nm, b=1.148 2(4) nm, c=1.209 0(6) nm, α=90°, β=96.92°, γ=90°, V=1.990 0(4) nm3 and Z=2. The macrocyclic ligand adapts a chair conformation, the crystallographic inv ersion center is located in the macrocyclic cavity, the six bromide ions and four water molecules are situated symmetrically outside the macrocyclic cavity. The new ligand with structural characteristics can be used for the study on the stabilities and catalytic properties of the corresponding metal complexes.%用Pb(SN)2作模板， 2，6-二甲酰基对甲苯酚与二亚乙基三胺通过［2+2］缩合反应， 经NaBH4还原、 脱Pb2+、 酸化等操作， 得晶体BDBPH*6HBr*4H2O. 晶体属单斜晶系， P21/c空间群， 晶体学参数： a=1．444 1（5） nm， b=1．148 2（4） nm， c=1．209 0（6） nm， α＝90°， β＝96．92°， γ＝90°， V＝1．990 0 nm3． 大环分子采取椅式构型， 6个Br－和4个H2O分子对称分布于大环两侧. 该大环配体结构新颖， 可用于多种金属配合物的研究， 对进一步了解金属酶活性中心的结构及其催化作用机理具有重要价值.
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