Tuning of the para-position of pyridyl ligands impacts the electrical properties of a series of Cd(ii) ladder polymers

Basudeb Dutta; Arka Dey; Chittaranjan Sinha; Partha Pratim Ray; Mohammad Hedayetullah Mir

doi:10.1039/c9dt01846h

Tuning of the para-position of pyridyl ligands impacts the electrical properties of a series of Cd(ii) ladder polymers

Dalton Trans. 2019 Aug 14;48(30):11259-11267. doi: 10.1039/c9dt01846h. Epub 2019 Jul 2.

Authors

Basudeb Dutta¹, Arka Dey², Chittaranjan Sinha³, Partha Pratim Ray⁴, Mohammad Hedayetullah Mir¹

Affiliations

¹ Department of Chemistry, Aliah University, New Town, Kolkata 700 156, India. chmmir@gmail.com.
² Department of Physics, Jadavpur University, Jadavpur, Kolkata 700 032, India. partha@phys.jdvu.ac.in and Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, Salt Lake, Kolkata 700106, India.
³ Department of Chemistry, Jadavpur University, Jadavpur, Kolkata 700 032, India.
⁴ Department of Physics, Jadavpur University, Jadavpur, Kolkata 700 032, India. partha@phys.jdvu.ac.in.

PMID: 31265028
DOI: 10.1039/c9dt01846h

Abstract

Herein, we report the synthesis, structural characterization and electrical conductivity of three new one-dimensional coordination polymers (1D CPs), [Cd(nip)(4-Clpy)(CH₃OH)] (1), [Cd(nip)(4-Brpy)(CH₃OH)] (2) and [Cd(nip)(4-Phpy)(H₂O)]·DMF·3H₂O (3) (H₂nip = 5-nitroisophthalic acid, 4-Clpy = 4-chloropyridine, 4-Brpy = 4-bromopyridine, 4-Phpy = 4-phenylpyridine and DMF = N,N-dimethylformamide). The conductivity of the compounds was successfully tuned via the modification of the para-position of the 4-Xpy (X = Cl, Br and Ph) ligands. The electrical analysis indicated that compound 3 has the highest conductivity (22.25 × 10^-4 S m^-1) under illumination followed by 2 (19.38 × 10^-4 S m^-1) and 1 (12.68 × 10^-4 S m^-1). The optical characterization and density functional theory (DFT) computation also support the observed progression of conductivity in the materials. Here, the highest conductivity of compound 3 is attributed to the better ππ stacking interactions among the 4-Phpy and nip ligands, and the consequently increased charge transport between adjacent chains.