1D to 3D and Chiral to Noncentrosymmetric Metal–Organic Complexes Controlled by the Amount of DEF Solvent: Photoluminescent and NLO Properties

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• 作者：Yuehong Wen ; Tianlu Sheng ; Chao Zhuo ; Xiaoquan Zhu ; Shengmin Hu ; Wenhai Cao ; Haoran Li ; Hao Zhang ; Xintao Wu
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：May 2, 2016
• 年：2016
• 卷：55
• 期：9
• 页码：4199-4205
• 全文大小：491K
• 年卷期：0
• ISSN：1520-510X

文摘

A mixture of 2D and 1D metal–organic complexes, [ZnL(H₂O)₂·G1·DEF·2H₂O]_n (1a: G1 = naphthalene-2,7-disulfonate; DEF = N,N-diethylformamide) and [ZnL(H₂O)₃·G1·DEF·2H₂O]_n (2), has been prepared from a hydrogenated Schiff base L and Zn(II) in a DEF-contained solvent system under mild conditions. The yields of 1a and 2 are equivalent; however, they can be tuned by varying the amount of DEF solvent. Increasing the use of DEF tends to form pure 1a, while decreasing it generates 2. Without DEF, another novel 3D four-connected CdSO₄ (cds) framework [ZnL(H₂O)₂·G1·2H₂O]_n (3) composed of alternated right-handed and left-handed helical chains has been constructed. The amount of DEF solvent has a significant impact on the diverse coordination architectures of 1–3, which is rare in the preparation of metal–organic complexes. The photoluminescence of complexes 1–3 along with naphthalene-2,7-disulfonate has been investigated in the solid state. The luminescent emission of G1 was enhanced greatly after being confined into metal–organic networks. In addition, complexes 1–3 display second-harmonic generation efficiencies, which are approximately 0.58, 0.42, 0.32, and 0.52 times as much as that of potassium dihydrogen phosphate.