Complexes of 2,2′-bipyrimidine and 3,6-di(2-pyridyl)tetrazine

JARADAT, Q.; Barqawi, K. R.; Akasheh, Talal S.

doi:10.1016/s0020-1693(00)84621-6

Cited by 48 publications

(12 citation statements)

References 58 publications

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“…The C−H stretching feature is the peak at 3054 cm −1 . We note that these modes of DPTZ on Ag or Au are generally softened relative to studies of DPTZ suspended in KBr 40,41 due to the interaction of DPTZ with the metal surface (Table 1).…”

Section: Resultsmentioning

confidence: 60%

Metal–Ligand Complexation through Redox Assembly at Surfaces Characterized by Vibrational Spectroscopy

et al. 2017

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The formation of metal–organic complexes on metal surfaces is a research topic of high interest to develop tunable functional surfaces. One such focus of this research is the formation of single site metal centers that have uniform ligand environments and thus uniform chemistry. We report the complexation of Pt and Ag with the ligand dipyridyl-tetrazine (DPTZ) on Ag(111) and of Pt with DPTZ on the reconstructed Au(100) surface. Each metal atom binds two DPTZ molecules resulting in one-dimensional supramolecular chains across the surface. Pt complexation occurs immediately after Pt deposition at room temperature on either surface. This complexation is improved with annealing to 170 °C on Au(100). DPTZ forms complexes with Ag atoms from the Ag(111) substrate when annealed to 110 °C. No similar complexation with substrate atoms is seen on Au(100). This metal–organic complexation with substrate atoms on Ag(111) takes place even when the DPTZ is already complexed to Pt, demonstrating a Pt replacement reaction by Ag at 80 °C, which has not been reported previously. The metal–organic complexes are characterized by high-resolution electron energy loss spectroscopy (HREELS), scanning tunneling microscopy (STM), and X-ray photoelectron spectroscopy (XPS). This research is among the few to use HREELS to characterize the formation of extended metal organic networks on a surface formed through the redox of the organic species into an anionic state.

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Section: Resultsmentioning

confidence: 60%

Metal–Ligand Complexation through Redox Assembly at Surfaces Characterized by Vibrational Spectroscopy

et al. 2017

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“…In the case of the corresponding dinuclear com plex with the related bptz ligand, the second oxi dation wave has been observed at about +1. 85 V vs. FeCp2+/° [4d,e]; replacement of two pyridyl by two less basic pyrimidyl groups causes the ex pected increase in the potentials for metal-centered oxidation processes. The second reduction step remains irreversible in the complex 1 at about -1.45 V. (2) shows only ill-de fined reduction waves beyond -I V vs. FeCp2+/°, most probably due to rapid chemical processes in volving the N -H functions.…”

Section: Cyclic Voltammetry Of {(W-bmtz)[ru(bpy)2]2}4+mentioning

confidence: 99%

The New Tetrafunctional π Acceptor Ligand 3,6-Bis(2′-pyrimidyl)-1,2,4,5-tetrazine (bmtz): Diruthenium Complexes of bmtz and of its 1,4-Dihydro Form

Kaim

Fees

1995

Zeitschrift Für Naturforschung B

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Synthesis, physical properties and the coordination with two [Ru(bpy)2]2+ complex frag ments are described for 3,6-bis(2'-pyrimidyl)-l,2,4,5-tetrazine (bmtz), the first compact ligand which offers four equivalent a-diimine chelate sites. Spectroelectrochemistry of intensely blue {(a-bmtz)[Ru(bpy)2]2}"+, n = 4, reveals a very facile reduction (n -3) at -0 .4 0 V vs. FeCp2+/o and a metal oxidation (n = 5) at +1.18 V to a diruthenium (II/III) mixed-valent form which exhibits an intervalence transfer absorption at 1490 nm. The corresponding complex {(M-H2bm tz)[Ru(bpy)2]2}4+ with the 1,4-dihydro form H 2bmtz of the tetrafunctional ligand is oxidized in two steps at 0.58 and 1.07 V vs. FeCp2+/°.

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“…[ 46,47 ] The SBS‐DPT spectra show the bending vibration peak of the –CN group at 1586 cm –1 . [ 48 ] With an increase in the click reaction degree, from SBS‐DPT1 to SBS‐DPT4, the peak intensity at 1586 cm –1 gradually improves. As the peak intensity at 700 cm –1 , which corresponds to the characteristic peak of aromatics in styrene units, is unchanged during modification, we chose this peak as a reference.…”

Section: Resultsmentioning

confidence: 99%

SBS Thermoplastic Elastomer Based on Dynamic Metal‐Ligand Bond: Structure, Mechanical Properties, and Shape Memory Behavior

Wang

et al. 2021

Macro Materials & Eng

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A Cooper(II) (Cu2+)‐nitrogen coordination‐crosslinked network is designed in poly(styrene‐co‐butadiene‐co‐styrene) (SBS) to change commercial elastomers into advanced soft materials. Herein, ligand groups into SBS molecular chains by the 3,6‐di(2‐pyridyl)‐1,2,4,5‐tetrazine (DPT) click reaction are first introduced. The results from fourier transform infrared (FT‐IR), 1H‐nuclear magnetic resonance, and X‐ray photoelectron spectroscopy (XPS) are verified the successful modification of SBS. The DPT‐grafted SBS could then coordinate with copper sulfate (CuSO4) to form a Cu2+‐nitrogen bond, which is further characterized using FT‐IR, XPS, atomic force microscope, scanning electron microscope, and geometric structure calculations. After modifying SBS to form an SBS‐DPT/CuSO4 composite (SBS‐DPT2‐Cu10), the tensile stress is improved from 11.43 to 23.25 MPa, while the elongation at break is remained almost unchanged, and the corresponding toughness is increased from 33.21 to 63.26 MJ m–3. Moreover, the dynamic nature of the Cu2+‐nitrogen coordination bonds enables the SBS‐DPT/CuSO4 composite to exhibit sustained thermoplastic performance and excellent shape memory behavior under an external thermal stimulus.

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Complexes of 2,2′-bipyrimidine and 3,6-di(2-pyridyl)tetrazine

Cited by 48 publications

References 58 publications

Metal–Ligand Complexation through Redox Assembly at Surfaces Characterized by Vibrational Spectroscopy

Metal–Ligand Complexation through Redox Assembly at Surfaces Characterized by Vibrational Spectroscopy

The New Tetrafunctional π Acceptor Ligand 3,6-Bis(2′-pyrimidyl)-1,2,4,5-tetrazine (bmtz): Diruthenium Complexes of bmtz and of its 1,4-Dihydro Form

SBS Thermoplastic Elastomer Based on Dynamic Metal‐Ligand Bond: Structure, Mechanical Properties, and Shape Memory Behavior

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