New morpholine- and piperazine-functionalized triphenylantimony(V) catecholates: The spectroscopic and electrochemical studies

o-Semiquinonato and o-iminosemiquinonato rhodium complexes. EPR study of the reactions in coordination sphere of rhodium

“…Scheme 2 represents the spatial configuration of piperazine substituent as a result of molecular modeling (''HyperChem'' 8.0.3). It is in agreement with structural results which are known for the catecholate dianion of this o-quinone [8]. It becomes clear that four protons (H⁄) can effectively interact with orbital occupied by unpaired electron which is p à in character.…”

Triaryl/trialkylantimony(V) catecholates with electron-acceptor groups

“…The presence of electron-withdrawing nitro group in 6 promotes the anodic oxidation potential shift and reduces the stability of the monocationic derivative of complex. (15) 119.74 (13) 87.46 (6) 87.17(6) O(1)eSb(1)eC (22) 84.68 (13) 120.66 (6) 120.73(6) O(1)eSb(1)eC (29) 126.18 (13) 118.40 (6) 118.95(6) C(22)eSb(1)eC (29) 100.98 (15) 118.61 (6) 118.00(6) C(22)eSb(1)eC (15) 101.87 (15) 99.23 (6) 99.42(6) C(15)eSb(1)eC (29) 111.36 (15) 98.55 (7) 98.69(6) O(2)eSb(1)eC (22) 161.64 (13) 86.98 (6) 87.19(6) O(2)eSb(1)eC (15) 90.79 (13) 166.65 (6) 166.23(5) O(2)eSb(1)eC (29) 86.42 (13) 88.65 (6) 88.66(6) 3 3 0.95 0.70 1 1.43 (4-Cl-3,6-DBCat)Sb(p-Cl-Ph) 3 4 0.97 0.71 n > 1 1.46 (6-NO 2 -3,5-DBCat)Sb(o-Tol) 3 6 1.20 0.55 n > 1 1.63 (6-Cl-3,5-DBCat)Sb(p-Tol) 3 7 1.00 0.72 1 1.58 (6-Br-3,5-DBCat)Sb(p-Tol) 3 8 0.99 0.82 1 1.45 (3,6-DBCat)SbPh 3 [14] e 0.89 0.82 1 1.40 (4-Cl-3,6-DBCat)SbPh 3 [12] e 0.98 0.81 1 1.37 (6-Cl-3,5-DBCat)SbPh 3 [12] e 1.00 0.52 1 1.60…”

“…1 H NMR (CDCl 3 , ppm): 1.40 (s, 9H, t-Bu), 1.39 (t, 3 J(H,H) ¼ 7.8 Hz, 9H, 3 CH 2 CH 3 ), 1.57 (s, 9H, t-Bu), 1.89 (q, 3 J(H,H) ¼ 7.8 Hz, 6H, 3 CH 2 CH 3 ), 6.575 (s, 1H, C 6 H 1 ). 13 Triarylantimony(V) catecholates 2e8 were synthesized from the corresponding o-benzoquinones and triarylstibines in toluene solution as described previously [8,9,12,13,16,25,26]. The yields of aimed products were more 85%.…”

The binuclear trimethyl/triethylantimony(V) bis-catecholate derivatives of four-electron reduced 4,4′-di-(3-methyl-6-tert-butyl-o-benzoquinone)

“…But in this case, we have no found the formation of spiroendoperoxides as described in refs. [6,30]. The reaction of bis-catecholate 1 with air oxygen leads to loss of one trimethylantimony group forming cherry-red colored quinone-catecholate (Me 3 Sb(Cat-Q)) (3) (Scheme 3).…”