Four cobalt(II) coordination polymers based on a flexible N,N鈥?bis(3-pyridinecarboxamide)-1,6-hexane ligand: Modulation of crystal architectures through the substituent groups of isophthalates

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• 作者：Xiu-Li Wang ; ^{wangxiuli@bhu.edu.cn" class="auth_mail} ; Jian Luan ; Hong-Yan Lin ; Guo-Cheng Liu ; Mao Le
• 关键词：Metal&ndash ; organic coordination polymer ; Bis-pyridyl-bis-amide ligand ; Isophthalate ; Substituent group ; Photocatalytic property
• 刊名：Polyhedron
• 出版年：29 March, 2014
• 年：2014
• 卷：71
• 期：Complete
• 页码：111-118
• 全文大小：2096 K

文摘

Four cobalt(II) mixed ligand coordination polymers based on the flexible N,N鈥?bis(3-pyridinecarboxamide)-1,6-hexane (3-dpyh) and four isophthalates with different substituent groups, namely [Co(3-dpyh)(5-HIP)(H₂O)₃]路H₂O (rong class="boldFont">1rong>), [Co(3-dpyh)(5-NIP)]路H₂O (rong class="boldFont">2rong>), [Co(3-dpyh)(5-MIP)]路H₂O (rong class="boldFont">3rong>) and [Co(3-dpyh)_0.5(5-AIP)(H₂O)]路2H₂O (rong class="boldFont">4rong>), have been hydrothermally synthesized and structurally characterized (5-H₂HIP = 5-hydroxyisophthalic acid, 5-H₂NIP = 5-nitroisophthalic acid, 5-H₂MIP = 5-methylisophthalic acid, 5-H₂AIP = 5-aminoisophthalic acid). X-ray diffraction analyses reveal that complex rong class="boldFont">1rong> is a chain constructed from a [Co-3-dpyh]_n meso-helical chain and 5-HIP anions, in which each 5-HIP anion adopts a monodentate mode coordinating to one Co(II) ion. The isostructural complexes rong class="boldFont">2rong> and rong class="boldFont">3rong> are assembled from 5-NIP and 5-MIP anions, respectively, featuring a 2D 3,5-connected network with the {4²路6⁷路8}{4²路6} topology, in which the two carboxyl groups of dicarboxylates exhibit 渭₁:畏¹-畏¹ and 渭₂:畏¹-畏¹ modes. When the 5-AIP anion is utilized in rong class="boldFont">4rong>, a different 2D (3,4)-connected {4²路6³路8}{4²路6} network is obtained, in which the two carboxyl groups of AIP exhibit 渭₁:畏¹-畏¹ and 渭₁:畏¹-畏⁰ modes, and the N atom of AIP also coordinates to the Co(II) ion. The influence of the substituent groups of the isophthalates on the structures has been discussed in detail. The fluorescent, electrochemical and photocatalytic properties of complexes rong class="boldFont">1rong>-rong class="boldFont">4rong> have also been investigated.