English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The reactions of cis -[Pt(OAc) 2 (DMSO) 2 ] with 2 equiv of sym N , N ', N ″-triarylguanidines, [ArN=C(NHAr) 2 ], in toluene under reflux condition for 8 h afforded six-membered cycloplatinated guanidines, [Pt{κ 2 ( C , N )}(OAc){κ 1  N (ArN=C(NHAr) 2 )}] [ sym = symmetrical; Ar = 2-MeC 6 H 4 ( 1 ) and 2,4-Me 2 C 6 H 3 ( 2 )], in 82 and 84% yields, respectively. The salt metathesis reaction of 1 with 1 equiv of AgTFA in CH 2 Cl 2 at room temperature (RT) afforded [Pt{κ 2 ( C , N )}(TFA){κ 1  N (ArN=C(NHAr) 2 )}] ( 3 ) in 94% yield. The reaction of cis -[Pt(TFA) 2 (DMSO) 2 ] with 1 equiv of [ArN=C(NHAr) 2 ] in toluene under reflux condition for 8 h afforded six-membered cycloplatinated guanidines, [Pt{κ 2 ( C , N )}(TFA)(DMSO)] [Ar = 2-MeC 6 H 4 ( 4 ), 4-MeC 6 H 4 ( 5 ), 2,4-Me 2 C 6 H 3 ( 6 ), and 2-(MeO)C 6 H 4 ( 7 )], in ≥73% yields. The reaction of trans -[PtCl 2 (PhCN) 2 ] with 2 equiv of [ArN=C(NHAr) 2 ] in toluene under reflux condition for 48 h afforded trans -[PtCl 2 {ArN=C(NHAr) 2 } 2 ] [Ar = 2-MeC 6 H 4 ( 8 ) and 2,4-Me 2 C 6 H 3 ( 9 )] in 90 and 45% yields, respectively. Complexes 8 and 9 were separately refluxed in MeOH for 8 h to afford six-membered cycloplatinated guanidines, [Pt{κ 2 ( C , N )}(μ-Cl)] 2 ( 10 and 11 ), in 93 and 96% yields, respectively, with concomitant formation of the respective guanidinium salts, [(ArNH) 3 C]Cl, as the byproduct. Platinacycle 10 was treated with 2 equiv of AgTFA in CH 2 Cl 2 at RT to afford six-membered cycloplatinated guanidine, [Pt{κ 2 ( C , N )}(μ-TFA)] 2 ( 12 ), in 94% yield. The new compounds were characterized by analytical techniques and multinuclear NMR ( 1 H, 13 C, and 195 Pt) spectroscopy, and further, molecular structures of 10 compounds were determined by single-crystal X-ray diffraction. The structural motif in 1 ·1/2CH 2 Cl 2 and 3 is novel in that it contains a planar six-membered [Pt{κ 2 ( C , N )}] unit and a nonplanar eight-membered [Pt{κ 2 ( N , O )}] ring, wherein OAc and the guanidine ligands are linked through a N-H···O hydrogen bond. The six-membered cycloplatinated structural motifs present in 10 / 11 ·C 7 H 8 and 12 ·CH 2 Cl 2 are also unprecedented in the literature. The number and nature of solution species of new complexes were unambiguously investigated by detailed NMR studies. The critical role of anions in Pt(II) precursors upon the course of cycloplatination and thus the motifs in the products were addressed. Plausible mechanisms of cycloplatination reactions are discussed.

acs omega

Critical Role of Anions in Platinum(II) Precursors upon the Structural Motifs of Six-Membered Cycloplatinated N,N′,N″-Triarylguanidines