An electrochemical investigation on the prevention of staining of copper by benzotriazole

Dugdale, I.; Cotton, J.B.

doi:10.1016/s0010-938x(63)80001-3

Cited by 222 publications

(97 citation statements)

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“…The "simpler" reaction between MnF 3 and btaH in boiling MeOH (50 8C) also produces complex 1. If this reaction is repeated in the presence of pyridine, the decametallic complex [Mn 10 O 6 (OH) 2 (bta) 8 (py) 8 0/ + , which consists of an oxo-centred metal triangle with m 2 -bta À ligands bridging each edge of the triangle and the fluoride ions acting as the terminal ligands. DC magnetic susceptibility measurements in the 300-1.8 K and 0.1-7 T ranges were investigated for all three complexes.…”

mentioning

confidence: 99%

New Routes to Polymetallic Clusters: Fluoride‐Based Tri‐, Deca‐, and Hexaicosametallic Mn^III Clusters and their Magnetic Properties

Jones

Rajaraman

Brockman

et al. 2004

Chemistry A European J

109

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The syntheses, structures and magnetic properties of three new MnIII clusters, [Mn26O17(OH)8(OMe)4F10(bta)22(MeOH)14(H2O)2] (1), [Mn(0O6(OH)2(bta)8(py)8F8] (2) and [NHEt3]2[Mn3O(bta)6F3] (3), are reported (bta=anion of benzotriazole), thereby demonstrating the utility of MnF3 as a new synthon in Mn cluster chemistry. The "melt" reaction (100 degrees C) between MnF(3) and benzotriazole (btaH, C6H5N3) under an inert atmosphere, followed by dissolution in MeOH produces the cluster [Mn26O17(OH)8(OMe)4F10(bta)22(MeOH)14(H2O)2] (1) after two weeks. Complex 1 crystallizes in the triclinic space group P1, and consists of a complicated array of metal tetrahedra linked by mu3-O2- ions, mu3- and mu2-OH- ions, mu2-MeO- ions and mu2-bta- ligands. The "simpler" reaction between MnF3 and btaH in boiling MeOH (50 degrees C) also produces complex 1. If this reaction is repeated in the presence of pyridine, the decametallic complex [Mn10O6(OH)2(bta)8(py)8F8] (2) is produced. Complex 2 crystallizes in the triclinic space group P1 and consists of a "supertetrahedral" [Mn(III)10] core bridged by six mu3-O2- ions, two mu3-OH- ions, four mu2-F- ions and eight mu2-bta- ions. The replacement of pyridine by triethylamine in the same reaction scheme produces the trimetallic species [NHEt3]2[Mn3O(bta)6F3] (3). Complex 3 crystallises in the monoclinic space group P2(1)/c and has a structure analogous to that of the basic metal carboxylates of general formula [M3O(RCO2)6L3]0/+, which consists of an oxo-centred metal triangle with mu2-bta- ligands bridging each edge of the triangle and the fluoride ions acting as the terminal ligands. DC magnetic susceptibility measurements in the 300-1.8 K and 0.1-7 T ranges were investigated for all three complexes. For each, the value of chi(M)T decreases with decreasing temperatures; this indicates the presence of dominant antiferromagnetic exchange interactions in 1-3. For complex 1, the low-temperature value of chi(M)T is 10 cm(3) K mol(-1) and fitting of the magnetisation data gives S=4, g=2.0 and D=-0.90 cm(-1). For complex 2, the value of chi(M)T falls to a value of approximately 5.0 cm(3) K mol(-1) at 1.8 K, which is consistent with a small spin ground state. For the triangular complex 3, the best fit to the experimental chi(M)T versus T data was obtained for the following parameters: Ja = -5.01 cm(-1), Jb = +9.16 cm(-1) and g=2.00, resulting in an S=2 spin ground state. DFT calculations on 3, however, suggest an S=1 or S=0 ground state with J(a)=-2.95 cm(-1) and J(b)=-2.12 cm(-1). AC susceptibility measurements performed on 1 in the 1.8-4.00 K range show the presence of out-of-phase AC susceptibility signals, but no peaks. Low-temperature single-crystal studies performed on 1 on an array of micro-SQUIDS show the time- and temperature-dependent hysteresis loops indicative of single-molecule magnetism behaviour.

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confidence: 99%

New Routes to Polymetallic Clusters: Fluoride‐Based Tri‐, Deca‐, and Hexaicosametallic Mn^III Clusters and their Magnetic Properties

Jones

Rajaraman

Brockman

et al. 2004

Chemistry A European J

109

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“…However, even at high temperature the 1NH 2 (5) group still was not reacted favorably with anhydride due to the very low reactivity. The reactivities were determined to decrease in the order 2NH (1) S 1NH 2 (3) S 1NH 2 (5).…”

Section: Discussionmentioning

confidence: 99%

An NMR study on polycondensation reactions of 3,5-diamino-1,2,4-triazole with dianhydrides and diacyl chlorides

Chang¹,

Kim²,

Ree³

et al. 1999

Macromol. Chem. Phys.

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SUMMARY: The reactivity of 3,5-1H-diamino-1,2,4-triazole (DAT) in condensation reactions with acetic anhydride, aromatic dianhydrides and diacyl chlorides was investigated. In comparison to ordinary aromatic diamines, the primary amino groups of DAT were found to have relatively low reactivities so that they are partially involved in the reactions. In contrast, the secondary amino group of DAT was determined to be so reactive that it is always involved completely in the reactions. The reactivities of the amino groups in DAT were found to decrease in the order 2NH(1) S 1NH 2 (3) S 1NH 2 (5). The low reactivites of the primary amino groups in DAT might be attributed to the relatively high electronegativity of the heterocyclic fivemembered nitrogens, the imino characteristics of the primary amino groups via tautomerization, and the amidization of the reactive secondary amino group and the resultant steric hinderance. Because of the limited reactivities, polymers with high molecular weight could not be synthesized from DAT with diacyl chlorides and dianhydrides.

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“…The high efficiency of this molecule is commonly attributed to the formation of a polymeric film on copper surface [1][2][3][4][5][6][7][8][9]. Since BTA can interact also with the iron surface, this molecule also shows interesting properties even towards the corrosion inhibition of iron, e.g.…”

Section: Introductionmentioning

confidence: 99%

Alkyl-benzotriazole derivatives as inhibitors of iron and copper corrosion

Trabanelli¹,

Frignani

Monticelli³

et al. 2015

Int. J. Corros. Scale Inhib.

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5-Alkyl derivatives of benzotriazole (1-12 carbon atom long alkyl chain) were tested as inhibitors of pure iron corrosion in sulphuric or hydrochloric acid at 25°C and pure copper corrosion in acidic sulphate and saline solutions at 30°C. This series of compounds was more efficient in contrasting copper than iron corrosion and, generally, the longer the alkyl chain the higher the inhibiting performances and the longer the persistency of the inhibiting action. However, due to a decrease in the solubility, the maximum inhibiting effects were produced by the hexyl derivative. In the case of iron, these compounds were more efficient in the hydrochloric acid solution than in the sulphuric one, while for copper they were more effective in the acidic sulphate solution than in the acidic chloride solution. The higher inhibiting effects for copper can be justified by the mode of BTA adsorption, that consists in chemisorption, instead of physisorption occurring on iron.

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An electrochemical investigation on the prevention of staining of copper by benzotriazole

Cited by 222 publications

References 0 publications

New Routes to Polymetallic Clusters: Fluoride‐Based Tri‐, Deca‐, and Hexaicosametallic Mn^III Clusters and their Magnetic Properties

New Routes to Polymetallic Clusters: Fluoride‐Based Tri‐, Deca‐, and Hexaicosametallic Mn^III Clusters and their Magnetic Properties

An NMR study on polycondensation reactions of 3,5-diamino-1,2,4-triazole with dianhydrides and diacyl chlorides

Alkyl-benzotriazole derivatives as inhibitors of iron and copper corrosion

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An electrochemical investigation on the prevention of staining of copper by benzotriazole

Cited by 222 publications

References 0 publications

New Routes to Polymetallic Clusters: Fluoride‐Based Tri‐, Deca‐, and Hexaicosametallic MnIII Clusters and their Magnetic Properties

New Routes to Polymetallic Clusters: Fluoride‐Based Tri‐, Deca‐, and Hexaicosametallic MnIII Clusters and their Magnetic Properties

An NMR study on polycondensation reactions of 3,5-diamino-1,2,4-triazole with dianhydrides and diacyl chlorides

Alkyl-benzotriazole derivatives as inhibitors of iron and copper corrosion

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Product

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New Routes to Polymetallic Clusters: Fluoride‐Based Tri‐, Deca‐, and Hexaicosametallic Mn^III Clusters and their Magnetic Properties

New Routes to Polymetallic Clusters: Fluoride‐Based Tri‐, Deca‐, and Hexaicosametallic Mn^III Clusters and their Magnetic Properties