Five Co(ii) coordination polymers with different counter anions based on [3, 5-di(4H-1, 2, 4-triazol-4-yl)benzoato]− ligand: directed synthesis, structures and magnetic properties. Issue 72 (25th September 2017)

• Record Type: Journal Article
• Authors: Jiang, Wen-Hong; Zhang, Han-Zhong; Hou, Guang-Feng; Ma, Dong-Sheng; Liu, Bin; Yu, Ying-Hui
• Is Part Of: RSC advances. Volume 7:Issue 72(2017)
• Page Start: 45641
• Page End: 45651
• Publication Date: 2017-09-25
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra07089f
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Five cobalt(ii ) coordination polymers were synthesized by reactions of HL with varied cobalt(ii ) salts and different templates under solvothermal conditions. Abstract : As a continuing challenge to obtain the desired coordination polymers in the synthesis stage, the counter ions, the metal–ligand ratio and the involvement of template have great impact on their structure construction and crystal growth. In this paper, three different crystals of coordination polymers1–3 {{[CoL(μ2 -OH)]} n (1 ), {[CoL2 (H2 O)]·H2 O} n (2 ), {[Co3 L3 (H2 O)]·3NO3 ·4H2 O} n (3 )} {L = [3, 5-di(4 H -1, 2, 4-triazol-4-yl)benzoate] − } were obtained in one pot with HL and Co(NO3 )2 . By tuning the reactants ratio and employing different templates, each complex could also be synthesized separately. Single-crystal X-ray analyses show that complex1 exhibited a two-dimensional (2D) layered gek2 net structure. Complex2 with deprotonated [L] − has two dimensional (2D) nets structure with 3, 5L66 topology. Complex3 displays a new 5, 5, 6, 6-connected three-dimensional (3D) topological network with a point symbol of (4 10 ·6 5 )(4 5 ·6 5 )2 (4 7 ·6 3 )2 (4 8 ·6 7 ). When the reactant Co(NO3 )2 was changed to CoCl2 or CoSO4, 4 and5 {{[CoL(Cl)]·H2 O} n (4 ) and {[Co2 L2 (SO4 )(H2 O)]·2H2 O} n (5 )} was formed with a similar structure to that of1 . Complexes4 and5 are two-dimensional (2D) frameworks with 4, 6L26 topology. Five complexes have been characterized by elemental analysis, infrared spectroscopy, powder X-ray diffraction and thermogravimetry measurements. The magnetic properties of1–5 are also investigated. The magnetic property investigation reveals that complex1 exhibits frequency-dependent behavior.