Magnetic feature and near-infrared absorption of a [Pt(mnt)₂]^--based H-bond supramolecular crystal

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• 作者：Cui-Ping Li^a ; ^b ; Li Nie^a ; ^b ; Wen-Bo Pei^a ; ^b ; ^{peiwenbo@163.com" class="auth_mail" title="E-mail the corresponding author} ; Li Li^a ; ^b ; Zheng-Fang Tian^c ; Jian-Lan Liu^a ; ^b ; Xu-Sheng Gao^a ; Xiao-Ming Ren^a ; ^b ; ^{xmren@njtech.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：H-bond supramolecular crystal ; Crystal structure ; Magnetic property ; Near-IR absorption
• 刊名：Journal of Solid State Chemistry
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：243
• 期：Complete
• 页码：38-43
• 全文大小：2032 K

文摘

A new salt [H₂DABCO][Pt(mnt)₂]₂ (1) (mnt^2-=maleonitriledithiolate and H₂DABCO²⁺ is diprotonated 1,4-diazabicyclo[2.2.2]octane) has been synthesized; its crystal structure, magnetic and near-IR absorption properties have been investigated. Two different [Pt(mnt)₂]^- anions form the strong π-dimers, labeled as Pt(1)-dimer and Pt(2)-dimer, with quite shorter Pt…Pt and S…S distances and molecular plane-to-plane distance (<3.5 Å) within a dimer. The [Pt(mnt)₂]₂^2- π-dimers are connected through the cations in the strong H-bond manner to form three-dimensional H-bond supramolecular crystal. The salt shows weak paramagnetism in 1.99–300 K and this is due to the existence of strong antiferromagnetic coupling within a π-dimer. In addition, a small thermal hysteresis loop is observed at ca. 120 K, indicating that a phase transition probably occurs that is further confirmed by variable-temperature IR spectra. Another fascinating functionality of 1 is the intense near-IR absorption in the region of 750–2500 nm, and this near-IR absorption feature makes it to be a promising optical material.