Metallaheteroborane chemistry: Part 16. Contrasting metal to heteroborane bonding modes in isoelectronic {MC2B9} and {MAs2B9} clusters. Synthesis and characterisation of [9-{Fe(CO)2(η5-C5H5)}-nido-7,8-C2B9H12], [7-{Fe(CO)2(η5-C5H5)}-nido-7,8-As2B9H10] and [7-{M(CO)2(η7-C7H7<

Bould, Jonathan; Kennedy, John D.; Ferguson, George; Deeney, F.Tony; O'Riordan, Gerald M.; Spalding, Trevor R.

doi:10.1039/b306776a

Cited by 13 publications

(1 citation statement)

References 49 publications

(52 reference statements)

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“…The BH stretch generally appears as a single peak in the regions 2400–2500 cm −1 , but the presence of both and in natural boron results in the splitting of bands [22, 23]. Other characteristic frequencies due to the presence of the ligand appear at 1595 cm −1 , 1449 cm −1 , and 752 cm −1 assigned to ν (C=N), ν (C−N), and ν (C−S) vibrations, respectively [24–26].…”

Section: Resultsmentioning

confidence: 99%

New Dihydro OO′Bis(Salicylidene) 2,2′ AminobenzothiazolylBorate Complexes: Kinetic and Voltammetric Studies of Dimethyltin Copper Complex with Guanine, Adenine, and Calf Thymus DNA

Arjmand

Mohani

Parveen

2006

Bioinorganic Chemistry and Applications

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The newly synthesized ligand, dihydro bis(salicylidene) 2,2′ aminobenzothiazolyl borate (2), was derived from the reaction of Schiff base of 2-aminobenzothiazole and salicylaldehyde with KBH4. (3) and (4) complexes of (2) were synthesized and further metallated with dimethyltindichloride to yield heterobimetallic complexes (5) and (6). All complexes have been thoroughly characterized by elemental analysis, and IR, NMR, EPR, and UV-Vis spectroscopy and conductance measurements. The spectroscopic data support square planar environment around the atom, while the atom acquires pentacoordinate geometry. The interaction of complex (5) with guanine, adenine, and calf thymus DNA was studied by spectrophotometric, electrochemical, and kinetic methods. The absorption spectra of complex (5) exhibit a remarkable “hyperchromic effect” in the presence of guanine and calf thymus DNA. Indicative of strong binding of the complex to calf thymus DNA preferentially binds through position of guanine base, while the adenine shows binding to a lesser extent. The kinetic data were obtained from the rate constants, kobs, values under pseudo-first-order conditions. Cyclic voltammetry was employed to study the interaction of complex (5) with guanine, adenine, and calf thymus DNA. The CV of complex (5) in the absence and in the presence of guanine and calf thymus DNA altered drastically, with a positive shift in formal peak potential Epa and Epc values and a significant increase in peak current. The positive shift in formal potentials with increase in peak current favours strong interaction of complex (5) with calf thymus DNA. The net shift in E 1/2 has been used to estimate the ratio of equilibrium constants for the binding of and complexes to calf thymus DNA.

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Section: Resultsmentioning

confidence: 99%

New Dihydro OO′Bis(Salicylidene) 2,2′ AminobenzothiazolylBorate Complexes: Kinetic and Voltammetric Studies of Dimethyltin Copper Complex with Guanine, Adenine, and Calf Thymus DNA

Arjmand

Mohani

Parveen

2006

Bioinorganic Chemistry and Applications

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Periodic trends and easy estimation of relative stabilities in 11-vertex nido-p-block-heteroboranes and -borates

Kiani¹,

Hofmann²

Highlights in Computational Chemistry II

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Density functional theory computations were carried out for 11-vertex nido-p-block-hetero(carba)boranes and -borates containing silicon, germanium, tin, arsenic, antimony, sulfur, selenium and tellurium heteroatoms. A set of quantitative values called ''estimated energy penalties'' was derived by comparing the energies of two reference structures that differ with respect to one structural feature only. These energy penalties behave additively, i.e., they allow us to reproduce the DFT-computed relative stabilities of 11-vertex nidoheteroboranes in general with good accuracy and to predict the thermodynamic stabilities of unknown structures easily. Energy penalties for neighboring heteroatoms (HetHet and HetHet¢) decrease down the group and increase along the period (indirectly proportional to covalent radii). Energy penalties for a fiverather than four-coordinate heteroatom, [Het 5k (1) and Het 5k (2)], generally, increase down group 14 but decrease down group 16, while there are mixed trends for group 15 heteroatoms. The sum of HetHet¢ energy penalties results in different but easily predictable openface heteroatom positions in the thermodynamically most stable mixed heterocarbaboranes and -borates with more than two heteroatoms.

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Nuclear magnetic resonance data of C7H15As2B9FeO2

Pardasani¹,

Pardasani²

2009

Chemical Shifts and Coupling Constants for Boron-11

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Cited by 13 publications

References 49 publications

New Dihydro OO′Bis(Salicylidene) 2,2′ AminobenzothiazolylBorate Complexes: Kinetic and Voltammetric Studies of Dimethyltin Copper Complex with Guanine, Adenine, and Calf Thymus DNA

New Dihydro OO′Bis(Salicylidene) 2,2′ AminobenzothiazolylBorate Complexes: Kinetic and Voltammetric Studies of Dimethyltin Copper Complex with Guanine, Adenine, and Calf Thymus DNA

Periodic trends and easy estimation of relative stabilities in 11-vertex nido-p-block-heteroboranes and -borates

Nuclear magnetic resonance data of C7H15As2B9FeO2

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