Synthesis, structural and photo-physical studies of transition metal complexes with Mannich bases derived from 2-mercaptobenzimidazole

Imran, Muhammad; Iqbal, Zafar; Bokhari, Tanveer Hussain; Latif, Shoomaila; Farooq, Afgan; Liaqat, Muhammad Arman; Mitu, Liviu

doi:10.4314/bcse.v32i3.7

Cited by 5 publications

(6 citation statements)

References 27 publications

(39 reference statements)

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“…Similarly, electronic spectrum of the Co-L2 complex depicts two allowed transitions at 1169.8 cm -1 , 1740.5 cm -1 assignable to 4 A2(F)  4 T1(F) and 4 A2(F)  4 T1(P) transitions respectively. These three transitions are in good agreement with tetrahedral stereochemistry [27,28].…”

Section: Uv-visible Spectral Analysis and Magnetic Momentsupporting

confidence: 57%

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Luminescent Complexes of Co(II), Ni(II), Cu(II), Zn(II)and Bi(III) with 2-Aminothiazole based Ligand and their Biological Studies

Kanwal¹,

Imran²,

Adil³

et al. 2020

Rev. Chim.

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3-(thiazol-2-yl carbamoyl) propanoic acid was synthesized by the reaction of 2-aminothiazole and succinic anhydride, which was employed as ligand (LH) for further reaction with Co(II), Ni(II), Cu(II), Zn(II) and Bi(III) chlorides at ambient conditions to afford respective metal complexes, denoted as Co-L2, Ni-L2, Cu-L2, Zn-L2 and Bi-L3. Both the ligand LH and metal complexes were characterized by techniques FT-IR, 1H-NMR, 13C-NMR, powder XRD, TGA and conductometry. FT-IR and NMR studies revealed that ligand (LH) behaved in anisobidentate fashion via carboxylate moiety. The ligand and metal complexes are also screened for their antibacterial and antifungal potential and found non-significant activities by most of the complexes, luminescent studies were also made and found Bi-L3 appreciably luminescent.

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Section: Uv-visible Spectral Analysis and Magnetic Momentsupporting

confidence: 57%

“…Conductometric studies of metal complexes (0.1 -0.5 S) revealed their non-electrolytic nature (Table 1.) [27,28]. The metal contents were determined on the basis of AAS/ICP-MS that showed Co-L2, Ni-L2, Cu-L2 & Zn-L2 and Bi-L3 type complexes.…”

Section: Resultsmentioning

confidence: 99%

Luminescent Complexes of Co(II), Ni(II), Cu(II), Zn(II)and Bi(III) with 2-Aminothiazole based Ligand and their Biological Studies

Kanwal¹,

Imran²,

Adil³

et al. 2020

Rev. Chim.

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“…In the 1 H NMR spectra, the broad signal at about 10.5 ppm is attributed to the proton of the -OH groups in each case of the Mannich base. Formation of mono-Mannich bases is proven by singlet signals (of the methylene group that acted as a linker between the phenol and the secondary amine) at about 3.72 ppm and their integration for two protons in each case [16,17]. The unsymmetrical nature of the piperazine units in the Mannich bases is supported by the observation of two signals of its protons in the range 2.68-3.60 ppm.…”

Section: Spectral Descriptionmentioning

confidence: 91%

“…calcd. (%) for C 17 (m, 7H, ArH), 3.72 (s, 2H, Ar-CH 2 ), 3.60 (t, 4H, (CH 2 ) 2 N-), 2.68 (t, 4H, (CH 2 ) 2 N-), 2.30 (s, 3H, CH 3 -Ar). 13…”

Section: Synthesis Of 5-methyl-2-((4-(pyridin-2-yl)piperazin-1-yl)metmentioning

confidence: 99%

Synthesis, characterization and crystal structures of two new phenolic mannich bases

Ayeni¹,

Watkins²,

Hosten³

2019

Bull. Chem. Soc. Eth.

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Two new Mannich bases, 5-methyl-2-((4-(pyridin-2-yl)piperazin-1-yl)methyl)phenol (1) and 5methyl-2-((4-(4-nitrophenyl)piperazin-1-yl)methyl)phenol (2), were prepared and characterized structurally with elemental analysis, IR, UV and NMR spectroscopic techniques as well as single crystal X-ray diffraction. Compound I crystallizes in the monoclinic space group P21/c with unit cell dimensions a = 6.6726 (2) Å, b = 17.0542(6) Å, c = 13.3222(4) Å, β = 100.832(1)°, V = 1489.00 (8) Å 3 , Z = 4, R1 = 0.0408, wR2 = 0.1143. Compound II crystallizes in the monoclinic space P21 with unit cell dimensions a = 5.9519(2) Å, b = 17.3315(8) Å, c = 15.7237(7) Å, β = 90.348(2)°, V = 1621.95(12) Å 3 , Z = 4, R1 = 0.0353, wR2 = 0.0965. Both compounds have their structures stabilized by hydrogen bonding and π•••π interactions.

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“…L-Zn(II) and L-Cu(II) complexes showed strong fluorescence emission with high intensity as compared to Ligand (L) and others metal complexes. The change in fluorescence intensity with formation of metal complexes is due to change in electron density on the ligand[22][23][24][25].…”

mentioning

confidence: 99%

Antibacterial activity studies of Co(II), Ni(II), Cu(II) and Zn(II) complexes with Mannich base ligand

Imran¹,

Farooq²,

Latif³

et al. 2019

Bull. Chem. Soc. Eth.

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A Mannich base ligand (L) was prepared by reacting 2-mercaptobenzimidazole, diphenylamine and benzaldehyde. This ligand (L) was further used for the preparation of four metal complexes with Co(II), Ni(II), Cu(II) and Zn(II) ions. The reactions were monitored by TLC. The synthesized compounds were structurally characterized using FTIR spectroscopy, UV-Visible spectroscopy, 1 Hand 13 C-NMR spectroscopy, ICP-OES/atomic absorption spectroscopy. It has been observed that the ligand (L) behaved in a monoanionic bidentate mode and the geometry of resulting complexes was tetrahedral. Conductivity analysis revealed their non-electrolytic nature. Antibacterial activity of the synthesized compounds was assessed through an agar well diffusion method against four strains of Gram-negative bacteria. L-Zn(II) complex showed best activity at all four concentrations against the four strains of Gram-negative bacteria.

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Synthesis, structural and photo-physical studies of transition metal complexes with Mannich bases derived from 2-mercaptobenzimidazole

Cited by 5 publications

References 27 publications

Luminescent Complexes of Co(II), Ni(II), Cu(II), Zn(II)and Bi(III) with 2-Aminothiazole based Ligand and their Biological Studies

Luminescent Complexes of Co(II), Ni(II), Cu(II), Zn(II)and Bi(III) with 2-Aminothiazole based Ligand and their Biological Studies

Synthesis, characterization and crystal structures of two new phenolic mannich bases

Antibacterial activity studies of Co(II), Ni(II), Cu(II) and Zn(II) complexes with Mannich base ligand

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