Study of new mononuclear platinum group metal complexes containing η5 and η6 – Carbocyclic ligands and nitrogen based derivatives and formation of helices due to NH⋯Cl interactions

Gupta, Gajendra; Gloria, Sairem; Das, Babulal; Rao, Kollipara Mohan

doi:10.1016/j.molstruc.2010.06.028

Cited by 26 publications

(10 citation statements)

References 55 publications

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“…The Ru-N and Ru-Cg bond lengths are comparable for the chlorido (1; [10]) and iodido (3) complexes (Table 3); Cg = the centroid of the p-cymene aromatic ring. Moreover, the Ru-N bond lengths agreed well with the average value of 2.11(4) Å (the range of 2.025-2.219 Å) of 30 ruthenium complexes, such as [Ru(η 6 -bz)(dpa)Cl]PF 6 [15], [Ru(η 6 -p-cym)(dpa)Cl]BF 4 [16] or [Ru(η 6 -hmbz)(dpa)Cl]PF 6 ·CH 2 Cl 2 [23], containing the N-donor dpa ligand, which have been deposited in the Cambridge Crystallographic Data Centre (CCDC) under the respective Cambridge Structural Database (CSD) refcodes; CSD version 5.37 updated to May 2016 [24]; bz = benzene, hmbz = 1,2,3,4,5,6-hexamethylbenzene. .…”

Section: Single Crystal X-ray Analysissupporting

confidence: 68%

“…The synthesis of the herein used complex [Ru(η 6 -p-cym)(dpa)Cl] + was reported in the literature, but with different reaction conditions (4 h/ambient temperature [15], 4 h/reflux [11], 6 h/reflux [16] or overnight stirring/50 °C [10]). In this work, the reaction time was considerably shortened to only 1 min, by using a microwave reactor.…”

Section: Synthesis and General Propertiesmentioning

confidence: 99%

“…Recently, the preparation [10,11,15,16], X-ray structure [10] and in vitro cytotoxicity [11] of the simple ruthenium(II) complex [Ru(η 6 -p-cym)(dpa)Cl]PF 6 were reported. In this work, its structure was modified by either different halogenido ligands (bromido or iodido) or monodentate O-coordinated carboxylato ligands (valproato or 4-phenylbutyrato).…”

Section: Synthesis and General Propertiesmentioning

confidence: 99%

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Half-Sandwich Ru(II) Halogenido, Valproato and 4-Phenylbutyrato Complexes Containing 2,2′-Dipyridylamine: Synthesis, Characterization, Solution Chemistry and In Vitro Cytotoxicity

et al. 2016

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Halogenido and carboxylato Ru(II) half-sandwich complexes of the general composition [Ru(η 6 -p-cym)(dpa)X]PF 6 (1-5) were prepared and thoroughly characterized with various techniques (e.g., mass spectrometry, NMR spectroscopy and X-ray analysis); dpa = 2,2 -dipyridylamine; p-cym = p-cymene; X = Cl − (for 1), Br − (for 2), I − (for 3), valproate(1−) (for 4) or 4-phenylbutyrate(1−) (for 5). A single-crystal X-ray analysis showed a pseudo-octahedral piano-stool geometry of [Ru(η 6 -p-cym)(dpa)I]PF 6 (3), with a η 6 -coordinated p-cymene, bidentate N-donor dpa ligand and iodido ligand coordinated to the Ru(II) atom. The results of the 1 H-NMR solution behaviour studies proved that the complexes 1-5 hydrolyse were in the mixture of solvents used (10% MeOD-d 4 /90% D 2 O). Complexes 1-5 were in vitro inactive against the A2780 human ovarian carcinoma cell line, up to the highest tested concentration (IC 50 > 100 µM).

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Section: Single Crystal X-ray Analysissupporting

confidence: 68%

Section: Synthesis and General Propertiesmentioning

confidence: 99%

Section: Synthesis and General Propertiesmentioning

confidence: 99%

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Half-Sandwich Ru(II) Halogenido, Valproato and 4-Phenylbutyrato Complexes Containing 2,2′-Dipyridylamine: Synthesis, Characterization, Solution Chemistry and In Vitro Cytotoxicity

et al. 2016

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“…Complexes of Cu II ,10 as well as Pd II and Pt II 11,12 with polydipyridylamines were investigated for use in biological applications. Earlier, monomeric complexes bearing di‐2‐pyridylamine and dimeric complexes with 1, 2‐bis(di‐2‐pyridylamino methyl)benzene were reported in our laboratory 13,14. However, complexes containing a di‐2‐pyridylamine unit with an amide group at the meta ‐position have not yet been reported.…”

Section: Introductionmentioning

confidence: 87%

Spectral and Structural Studies of Platinum Group Metal Complexes of3‐(Di‐2‐Pyridylaminomethyl)Benzamide and Formation of Mutual Intermolecular Hydrogen Bonding in Some Complexes

Gloria

Wang

Rao

2012

Zeitschrift anorg allge chemie

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The new ligand, 3-(di-2-pyridylaminomethyl)benzamide, L, which carries two different coordination sites, i.e. the primary amide moiety on one side and a di-2-pyridylamine unit as a strong chelating group on the other side is synthesized. Reaction of chloro-bridged dimers viz., [(η 6 -arene)Ru(μ-Cl)Cl] 2 and [Cp*M(μ-Cl)Cl] 2 with two equivalents of the ligand L in methanol followed by the addition of NH 4 BF 4 results the formation of mononuclear complexes of the formu-

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“…Examples of (1H-pyrazol-1-yl)pyrazine coordinated to transition metal have been previously described (2,3). Bis-pyrazolylpyrazine derivatives coordinated to a transition metal ion have been described (4)(5)(6)(7)(8)(9)(10)(11), although this includes, to the best of our knowledge, no example of the 2,5 substitutions. Photochemical behavior indicates that upon excitation, pyrazine and pyrazine derivatives would lead to hydrogen cyanide release (12) or experience transposition (13,14).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Pyrazolyl Substituents on the Photophysical and Photochemical Properties of Pyrazine Derivatives

Pizarro

Prado

Saldías

et al. 2018

Photochem & Photobiology

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The reaction of 2,5-dibromopyrazine with N-Lithium pyrazolate in a 1:2 ratio leads to a mixture of 2-bromo-5-(1H-pyrazol-1-yl)pyrazine (I) and 2,5-di(1H-pyrazol-1-yl)pyrazine (II). The structures of I and II are highly planar. Two absorption bands can be observed for the compounds in the UV-Vis region, having ε in the order of 10 m cm . TD-DFT computed results support the nature of the lower energy absorptions as π →π* transitions, including an additional intraligand charge transfer transition for I (π →π* ). Upon excitation at 280 or 320 nm, the emission of both compounds is almost not affected by solvent polarity or oxygen presence, showing two bands for I and one for II in the 350-450 nm region. Emission of II follows a mono-exponential decay, while I decays following a bi-exponential law, hypothesized from π →π* and π →π* transitions. Photodegradation of I and II follows a first-order kinetic with constants of 1.18 × 10 min and 0.13 × 10 min , respectively. Results suggest that photodegradation of I starts with the loose of bromide followed by intermolecular pyrazolyl subtraction and ring opening. This path is not available for II, which is reflected in its enhanced photostability.

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Study of new mononuclear platinum group metal complexes containing η5 and η6 – Carbocyclic ligands and nitrogen based derivatives and formation of helices due to NH⋯Cl interactions

Cited by 26 publications

References 55 publications

Half-Sandwich Ru(II) Halogenido, Valproato and 4-Phenylbutyrato Complexes Containing 2,2′-Dipyridylamine: Synthesis, Characterization, Solution Chemistry and In Vitro Cytotoxicity

Half-Sandwich Ru(II) Halogenido, Valproato and 4-Phenylbutyrato Complexes Containing 2,2′-Dipyridylamine: Synthesis, Characterization, Solution Chemistry and In Vitro Cytotoxicity

Spectral and Structural Studies of Platinum Group Metal Complexes of3‐(Di‐2‐Pyridylaminomethyl)Benzamide and Formation of Mutual Intermolecular Hydrogen Bonding in Some Complexes

The Effect of Pyrazolyl Substituents on the Photophysical and Photochemical Properties of Pyrazine Derivatives

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