Cyclometalated Platinum(II) Terpyridylacetylide with a Bis(arylamine) Donor as a Proton-Triggered Luminescence Chemosensor for Zn2+

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• 作者：Dongfang Qiu ; Mengmeng Li ; Qian Zhao ; Hongwei Wang ; Chunxia Yang
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：August 17, 2015
• 年：2015
• 卷：54
• 期：16
• 页码：7774-7782
• 全文大小：666K
• ISSN：1520-510X

文摘

A cyclometalated Pt(II) acetylide derivative bearing a bis(arylamine) donor (D) and a terpyridine (TPY) receptor (A) was successfully synthesized and characterized. This three-component D鈭捪€鈥揂 system displays an intense low-energy absorption band at 位_max = 470 nm, resulting from overlapping the d蟺(Pt) 鈫?蟺*(C^N^N) metal-to-ligand charge transfer and 蟺(C鈮鈥揂r) 鈫?蟺*(C^N^N) ligand-to-ligand charge transfer transitions with the 蟺(bis(arylamine)) 鈫?蟺*(C^N^N) intraligand charge transfer transition. Upon protonation of the bis(arylamine) donor, a strong emission from the phosphorescence Pt(II) complex unit is recovered at 位_max = 580 nm. With introduction of the TPY receptor, this complex possesses quite high affinity for Zn²⁺ (K_a = 6.86 脳 10⁹ mol^鈥?路dm⁶) to form the heterotrinuclear Pt鈥揨n鈥揚t complex in CH₂Cl₂ solution. Though this coordination effect is seriously inhibited by protons in acidic medium, the 2.4-fold luminescence intensity enhancement is obtained yet, strongly suggesting the presence of the intramolecular energy transfer process from the Zn(II)-TPY complex core to the phosphorescence Pt(II) complex units at two ends. The H⁺-triggered and Zn²⁺-enhanced luminescence can be reversibly switched on and off upon successive additions of H⁺ and OH^{鈥?/sup>. Furthermore, this complex displays an unexpected Zn2+-selective luminescence enhancement effect in acidic solution.}