Synthesis and Characterization of Hydrazone and Azine Derivatives of Bis(cyclopentadienyl)titanium(IV)

Khera, B.; Sharma, Anand; Kaushik, N. K.

doi:10.1246/bcsj.58.793

Cited by 10 publications

(6 citation statements)

References 8 publications

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“…The bis(salicylaldimine) ligand ( 1 ‐NN)H 2 has been prepared according to a literature procedure5 that involves condensation of two equivalents of 3,5‐di‐ t Bu‐salicylaldehyde with one equivalent of hydrazine. Such O , N , N , O ‐ligands have been used earlier in the chemistry of various metals (Ti, Ru, Fe, Cu and Zn)6 but hitherto no binuclear alkaline‐earth metal complexes have been described.…”

Section: Resultsmentioning

confidence: 99%

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Binuclear Magnesium, Calcium, and Zinc Complexes Based on Nitrogen–Nitrogen‐Coupled Salicylaldiminate and β‐Diketiminate Ligands

et al. 2009

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The diprotic bis(salicylaldimine) ligand N,N′‐bis(3,5‐di‐tBu‐salicylidene)diimine, (1‐NN)H2, was smoothly deprotonated by reaction with two equivalents of a metal amide M[N(SiMe3)2]2 (M = Mg, Ca or Zn) to form a bimetallic metal amide complex (1‐NN)[MN(SiMe3)2]2. This heteroleptic complex was only stable in the case of Mg and (1‐NN)[MgN(SiMe3)2·thf]2 was structurally characterized by X‐ray diffraction. For Ca and Zn homoleptic products could be obtained: (1‐NN)Ca·(thf)2 and (1‐NN)Zn. The latter crystallized as a trimer with approximate C3‐symmetry. The diprotic N–N coupled bis(β‐diketimine) ligand [RHN–C(Me)=C–C(Me)=N–N=C(Me)–C=C(Me)–NHR, R = 2,6‐di‐iPr‐C6H3], which is abbreviated as (2‐NN)H2, can be deprotonated only under much harsher reaction conditions. Attempted synthesis of (2‐NN)[Mg(nBu)]2 gave after ligand exchange the homoleptic species (2‐NN)Mg and Mg(nBu)2. For Ca, the complexes [(2‐NN)Ca]2 and (2‐NN)[CaN(SiMe3)2·thf]2 both have been prepared and structurally characterized by X‐ray diffraction. The latter heteroleptic complex is in benzene solution in equilibrium with [(2‐NN)Ca]2 and Ca[N(SiMe3)2]2·(thf)2. Reaction of (2‐NN)H2 with excess of Et2Zn gave the heteroleptic complex (2‐NN)[ZnEt]2 and is stable towards ligand exchange reactions. The complex is not active in CO2/cyclohexene oxide copolymerization. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

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Section: Resultsmentioning

confidence: 99%

“…of the diamine (hydrazine). Although a large variety of connected β‐diketimine ligands has been reported,5,8 this particular linkage of ligands was hitherto unknown.…”

Section: Resultsmentioning

confidence: 99%

Binuclear Magnesium, Calcium, and Zinc Complexes Based on Nitrogen–Nitrogen‐Coupled Salicylaldiminate and β‐Diketiminate Ligands

et al. 2009

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“…Ligand 1H was purchased from Aldrich, 2H and 3H 2 -5H 2 were synthesised using literature procedures [36] and recrystallised from petroleum ether prior to use. Ti(OiPr) 4 was purchased from Aldrich and purified by vacuum distillation prior to use.…”

Section: Methodsmentioning

confidence: 99%

Titanium(IV) Complexes of Hydrazones and Azines

et al. 2006

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The coordination modes of various azines (C=N-N=C) and hydrazones (C=N-NR 2 ) with titanium(IV) are investigated. Five ligands were studied, two hydrazones 1H-2H and three azines 3H 2 -5H 2 , and it was found that hydrazones form monomers and azines form dimers in the solid state. The hydrogen-bonded arrays observed for the hydrazones were significantly different for the two ligands, with one forming a

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“…In a depth study of IR spectra of complexes show several new bands of medium to weak intensity at around 585 and 430 cm" 1 attributable to v(Si«-N)' 6 and v(Sn«-N) vibrations, respectively. 17 , respectively. Apart from this, the bands at 445cm" 1 and 440 cm' 1 may be assigned to v(Ti-C 5 H 5 ) and v(Zr-C 5 H 5 ) 18 vibrations, respectively (Table-II …”

Section: Spectral Studies Ir Spectramentioning

confidence: 97%

Biologically Potent New Heterobimetallic Complexes of Platinum, Silicon, Tin, Titanium and Zirconium

Sharma¹,

Fahmi²,

Singh³

2002

Main Group Metal Chemistry

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Biologically potent tetraazamacrocyclic heterobimetallic complexes of silicon, tin, titanium, zirconium and platinum have been synthesized by the reactions of monometallic [Pt(C 4 H i3N 3 ) 2 ]Cl 2 with organometallic compounds of silicon, tin, titanium and zirconium in 1:2 molar ratios in methanol. The complexes were characterized by physicochemical and spectroscopic methods and a square planar geometry has been suggested for the resulting macrocyclic complexes. These have been screened for their antimicrobial activity against several microbes and the results are compared with the starting materials. INTRODUCTIONTransition metal complexes of binucleating ligands 1 are of interest because they provide the opportunity to study the intramolecular binding and possible activation of small substrate molecules between the metal centres, along with magnetic exchange infractions and multielectron redox reactions. They may also serve as models for certain metal loproteins'. Heterobimetallic transition metal complexes have received much attention in recent years 3 . Many types of binuclear complexes with bridging ligands have been synthesized and used in studies of electron-transfer processes and metal-metal infractions 4 . Bridging ligands can change the nature of metal-metal interactions. For example, studies on binuclear complexes with bridging imidazolate ligands suggest that imidazolate is particularly efficient in promoting electron transfer 5 .The chemistry of multimetallic systems is an emerging area of material science as documented by the increase in the number of publications . Various metals have been incorporated in all of the topologically different parts of dendritic structures providing new materials which, in some cases have been shown to possess interesting properties in catalysis 7 ' 8 , electrochemistry, photophysics 9 and as molecular sensor for gas. Electron transfer processes in binuclear ruthenium complexes have been the subject of interest due to the fact that these play vital roles in industrial endeavors as well as in biological organisms 10 . In addition, these complexes have been used as homogenous catalysts for the hydrogenation of unsaturated substrates". Platinum metal have attracted considerable interest owing to their anticancer activity and biological activity 12 . In the present paper, we have made an attempt for the synthesis and characterization of new heterobimetallic complexes of platinum and group fourteen elements.

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Synthesis and Characterization of Hydrazone and Azine Derivatives of Bis(cyclopentadienyl)titanium(IV)

Cited by 10 publications

References 8 publications

Binuclear Magnesium, Calcium, and Zinc Complexes Based on Nitrogen–Nitrogen‐Coupled Salicylaldiminate and β‐Diketiminate Ligands

Binuclear Magnesium, Calcium, and Zinc Complexes Based on Nitrogen–Nitrogen‐Coupled Salicylaldiminate and β‐Diketiminate Ligands

Titanium(IV) Complexes of Hydrazones and Azines

Biologically Potent New Heterobimetallic Complexes of Platinum, Silicon, Tin, Titanium and Zirconium

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