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Institution

North Eastern Hill University

EducationShillong, Meghalaya, India
About: North Eastern Hill University is a education organization based out in Shillong, Meghalaya, India. It is known for research contribution in the topics: Population & Ruthenium. The organization has 2318 authors who have published 4476 publications receiving 48894 citations.
Topics: Population, Ruthenium, Ligand, Catalysis, Micelle


Papers
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Journal ArticleDOI
TL;DR: Experimental observation under three controlled light conditions showed that the growth status and survival rates of seedlings under intermediate and low light were better than those under the high light condition, which is of immense value in formulating appropriate conservation measures for the species.
Abstract: Detailed studies on population structure and regeneration ecology of Ilex khasiana were carried out at five representative natural populations i.e. Mylliem (Population - I), Upper Shillong (Population - II), Shillong Peak (Population - III), Laitkor (Population - IV) and Nongpiyur (Population - V) to probe into the responsible affecting factors for its population structure and regeneration ability in these populations. Experimental observation under three controlled light conditions (full sunlight (100%), intermediate sunlight (50%) and low sunlight (30%)) showed that the growth status and survival rates of seedlings under intermediate and low light were better than those under the high light condition. The density-diameter distribution in population of adult trees (≥5cm dbh) exhibited a typical character of a regenerating population. A higher seedling mortality rate in natural populations of I. khasiana was most probably due to increase in light intensity following vegetation destruction and other anthropogenic disturbances that cause opening of forest canopy. The findings of the present study would be of immense value in formulating appropriate conservation measures for the species.

17 citations

Journal ArticleDOI
TL;DR: In this paper, the α-oxoketene dithioacetals of general formula 1 (Scheme 2), undergo regioselective 1,2-addition with allyl anions to afford the corresponding carbinol acetals 6 in quantitative yields, which on treatment with BF3.Et2O in refluxing benzene yield the corresponding aromatic systems.
Abstract: The α-oxoketene dithioacetals of general formula 1 (Scheme 2), undergo regioselective 1,2-addition with allyl anions to afford the corresponding carbinol acetals 6 in quantitative yields, which on treatment with BF3.Et2O in refluxing benzene yield the corresponding aromatic systems. The method has been shown to be widely applicable as exemplified by a large number of allyl anions (Scheme 3) reacting with α-oxoketene dithioacetals with wide structural variation. However, when 1 carry the α-substituent the intermediate carbinol acetals 14 (Scheme 4) follow, different path to yield the corresponding indenes 15 in good yields. The cinnamoylketene dithioacetals 16 react with allyl anions to afford the corresponding methylthiostilbenes 18 (Scheme 5), while the homologous dithioacetal 20 failed to yield the corresponding 1,4-biaryl-1,3-diene 22 (Scheme 6). This limitation was circumvented by reacting 23 with allyl anions to afford the corresponding stilbenes 24, dienes 25 and triene 26 respectively. The...

17 citations

Journal ArticleDOI
TL;DR: In this paper, the electronic and optical properties of bilayer AA′ stacked hexagonal Boron Nitride (h-BN) with B and N vacancy defects were investigated by using density functional theory.
Abstract: We have investigated the electronic and optical properties of bilayer AA′ stacked hexagonal Boron Nitride (h-BN) with B and N vacancy defects by using density functional theory (DFT). The two single layers of h-BN are stacked in layers to form the h-BN bilayer. The inter-layer interaction between the two layers of h-BN bilayer is governed by the introduction of van der Waals potential (vdW). The calculated energy band gap for the pristine h-BN bilayer is found to be ~4.56 eV. The density of states (DOS) and electronic band structure showed that both Boron and Nitrogen vacancies in bilayer h-BN results in magnetic ground state. Considering the presence of 1,3,4-Boron vacancies, half-metallic character is observed. However, the 2 Boron vacancy resulted in metallic character. The bilayer with 1,2,3,4-Nitrogen vacancies preserved the semiconducting band gaps of different width in both the spin channels which are significantly less than the pristine band gap. Also, B and N vacancy induces ferromagnetism in the h-BN bilayer. The maximum total magnetic moment for the Boron vacant system is 6.583μB in case of 4-Boron vacancy defects. In case of Nitrogen vacancy system it is found to be 3.926 μB for 4-Nitrogen vacancy defects. The optical response of the system is presented in terms of the absorption coefficient, refractive index and dielectric constant for pristine as well as for the defective configurations. Negative value of dielectric constant for Boron vacant system has been observed in the energy range 0.9–1.4 eV and for Nitrogen vacant system the energy range 0.5–0.8 eV. These results open an opportunity for it's utilization in the negative index optical materials. The current study shows that B and N vacancies in bilayer h-BN could have potential applications in nano-structure based electronics, optoelectronics and spintronic devices.

17 citations

Journal ArticleDOI
Abstract: The indenyl ruthenium(II) azide complexes [(η5-C9H7)Ru(L2)N3], L2 = (PMe2Ph)2 (1), dppe (2) and dppm (3), (where dppe = Ph2PCH2CH2PPh2 and dppm = PPh2CH2PPh2) were readily prepared by the reaction of NaN3 with corresponding chloro complexes [(η5-C9H7)Ru(L2)Cl]. The azido complexes undergo [3 + 2] dipolar cycloaddition reactions with activated alkynes and nitrile (NCCH = CHCN) to yield new indenyl ruthenium triazolato complexes [(η5-C9H7)Ru(L2)(N3C2(CO2R)2)], L2 = (PMe2Ph)2, R = Me (4), Et (5); L2 = dppe, R = Et (6), L2 = dppm, R = Et (7) and [(η5-C9H7)Ru(L2)(N3C2HCN)], L2 = (PMe2Ph)2 (8), L2 = dppe (9), L2 = dppm (10). The complexes were fully characterized on the basis of microanalyses, IR and NMR spectroscopy. The structures of representative complexes 4 and 9 have been determined by single-crystal X-ray methods.

17 citations

Journal ArticleDOI
TL;DR: In this paper, a new general method for substituted carbazoles was developed involving base induced conjugate addition-elimination sequence of indole-3-acetonitriles 1 to various α-oxoketene S,S-,O,S- and N,Sacetals 2a-x followed by cyclization of the intermediates 3 with p -toluenesulfonic acid in refluxing benzene.

17 citations


Authors

Showing all 2368 results

NameH-indexPapersCitations
Vivek Sharma1503030136228
Patrick J. Carroll5850513046
Majeti Narasimha Vara Prasad5622715193
Arun Sharma5537111364
Michael Schmittel5338710461
Birgitta Bergman5218710975
Harikesh Bahadur Singh463077372
Lal Chand Rai401344513
B. Dey403548089
Hiriyakkanavar Ila364075633
Jürgen-Hinrich Fuhrhop352085130
Sreebrata Goswami341423228
Gagan B.N. Chainy331074151
J.P. Gaur31643957
Hiriyakkanavar Junjappa303494102
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202321
202254
2021352
2020308
2019293
2018306