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Title: A Redox‐Active Tetrazine‐Based Pincer Ligand for the Reduction of N‐Oxyanions Using a Redox‐Inert Metal

Journal Article · · Chemistry - A European Journal

Abstract The reaction chemistry of the bis‐tetrazinyl pyridine ligand (btzp) towards nitrogen oxyanions coordinated to zinc is studied in order to explore the reduction of the NO x substrates with a redox‐active ligand in the absence of redox activity at the metal. Following syntheses and characterization of (btzp)ZnX 2 for X=Cl, NO 3 and NO 2 , featuring O−Zn linkage of both nitrogen oxyanions, it is shown that a silylating agent selectively delivers silyl substituents to tetrazine nitrogens, without reductive deoxygenation of NO x −1 . A new synthesis of the highly hydrogenated H 4 btzp, containing two dihydrotetrazine reductants is described as is the synthesis and characterization of (H 4 btzp)ZnX 2 for X=Cl and NO 3 , both of which show considerable hydrogen bonding potential of the dihydrotetrazine ring NH groups. The (H 4 btzp)ZnCl 2 complex does not bind zinc in the pincer pocket, but instead H 4 btzp becomes a bridge between neighboring atoms through tetrazine nitrogen atoms, forming a polymeric chain. The reaction of AgNO 2 with (H 4 btzp)ZnCl 2 is shown to proceed with fast nitrite deoxygenation, yielding water and free NO. Half of the H 4 btzp reducing equivalents form Ag 0 and thus the chloride ligand remains coordinated to the zinc metal center to yield (btzp)ZnCl 2 . To compare with AgNO 2 , experiments of (H 4 btzp)ZnCl 2 with NaNO 2 result in salt metathesis between chloride and nitrite, highlighting the importance of a redox‐active cation in the reduction of nitrite to NO.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1805050
Journal Information:
Chemistry - A European Journal, Journal Name: Chemistry - A European Journal Journal Issue: 45 Vol. 27; ISSN 0947-6539
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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