Reversible Thermochromism of Nickel(II) Complexes and Single-Crystal-to-Single-Crystal Transformation

Jayaraman Pitchaimani; Subramanian Karthikeyan; Narayanan Lakshminarasimhan; Savarimuthu Philip Anthony; Dohyun Moon; Vedichi Madhu

doi:10.1021/acsomega.9b01263

Reversible Thermochromism of Nickel(II) Complexes and Single-Crystal-to-Single-Crystal Transformation

ACS Omega. 2019 Aug 15;4(9):13756-13761. doi: 10.1021/acsomega.9b01263. eCollection 2019 Aug 27.

Authors

Jayaraman Pitchaimani¹, Subramanian Karthikeyan², Narayanan Lakshminarasimhan³, Savarimuthu Philip Anthony⁴, Dohyun Moon⁵, Vedichi Madhu¹

Affiliations

¹ Department of Chemistry, Karunya Institute of Technology and Science (Deemed to be University), Coimbatore 641114, Tamil Nadu, India.
² PG and Research Department of Chemistry, KhadirMohideen College, Adirampattinam 614701, Tamil Nadu, India.
³ Functional Materials Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630003, Tamil Nadu, India.
⁴ School of Chemical & Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India.
⁵ Beamline Department, Pohang Accelerator Laboratory, 80 Jigokro-127 beongil, Nam-gu, Pohang 37673, Gyeongbuk, Korea.

Abstract

A molecular Ni(II)-NNN pincer complex (1) exhibited unprecedented reversible single-crystal-to-single-crystal transformation and color change upon heating and cooling due to a subtle change in the N-Ni(II) bond length and ligand conformation. UV-vis, thermogravimetric, differential scanning calorimetry, single-crystal structural data, temperature-dependent powder X-ray diffraction, and Raman and computational studies supported the structural change of the Ni(II) complex with temperature.