Hybrid materials based on transition metal-BTC-benzimidazole: solvent assisted crystallographic and structural switching

Five transition metal-BTC-BIm based coordination polymers, namely [Zn 2 (HBTC) 2 (BIm) 2 (H 2 O) 2 ]·(H 2 O) 3 , 1 ; [2-HABI] 2 [Zn 2 (BTC) 2 (2-ABI)(H 2 O)]·(H 2 O) 5 , 2 ; [Cu 3 (BTC) 2 (BIm) 6 ][solvent], 3 ; [Co 4 (BTC) 3 (BIm) 6 ][solvent], 4 ; and [(CH 3 CH 2 ) 2 NH 2 ][Zn(BTC)(BIm)]·(H 2 O),...

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Bibliographic Details
Published in:CrystEngComm 2018, Vol.2 (41), p.662-6612
Main Authors: Tiwari, Ranjay K, Behera, J. N
Format: Article
Language:English
Subjects:
Aminobenzimidazole
Coordination polymers
Crystal structure
Crystallography
Dielectric properties
Dielectric relaxation
Diffraction
Single crystals
Solvents
Structural analysis
Switching theory
Thermogravimetric analysis
Transition metals
Trimesic acid
X ray analysis
X ray powder diffraction
X-ray diffraction
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Summary:Five transition metal-BTC-BIm based coordination polymers, namely [Zn 2 (HBTC) 2 (BIm) 2 (H 2 O) 2 ]·(H 2 O) 3 , 1 ; [2-HABI] 2 [Zn 2 (BTC) 2 (2-ABI)(H 2 O)]·(H 2 O) 5 , 2 ; [Cu 3 (BTC) 2 (BIm) 6 ][solvent], 3 ; [Co 4 (BTC) 3 (BIm) 6 ][solvent], 4 ; and [(CH 3 CH 2 ) 2 NH 2 ][Zn(BTC)(BIm)]·(H 2 O), 5 have been synthesized and characterized using complementary techniques like single crystal X-ray analysis, powder X-ray diffraction (PXRD) and thermogravimetric analysis (TGA) (BTC = 1,3,5-benzene tricarboxylic acid, BIm = benzimidazole and 2-ABI = 2-aminobenzimidazole). Crystal structure analysis of these compounds showed that 1 forms a 1D chain, 2 and 3 have 2D layers while 4 and 5 have three-dimensional architectures. 3 forms a hexagonal bronze sheet, 4 has a three-dimensional network with embedded paddlewheel SBUs and helical assembly, and 5 crystallizes in a polar space group ( Pna 2 1 ) with 3D helical networks with adamantane-type topology. The dielectric properties of 5 showed that the dielectric constant rapidly decreases with an increase in frequency suggesting dipole relaxation at low frequencies. Five transition metal-BTC-BIm based coordination polymers with hierarchical structures were synthesized under hydro/solvothermal condition. Crystal structure analysis of the compounds showed that 1 forms a 1D chain, 2 and 3 have 2D layers, while 4 and 5 have three-dimensional architectures.
ISSN:1466-8033
1466-8033
DOI:10.1039/c8ce01299g