报告题目：Soft-oxometalates (SOMs): An Update

报告人：Prof. Soumyajit Roy

Eco-friendly Applied Materials Laboratory,

Indian Institute of Science Education & Research (IISER), India.

报告时间：2016年05月30日(星期一)下午2:00

报告地点：无机/超分子楼A501

报告摘要：

The field of polyoxometalates [1], a class of metal-oxide based neutral or anionic or cationic clusters, in recent times, has entered a new arena ‘soft’-supramolecular interactions, crossing the molecular regime of covalent bonds. The structures resulting from such ‘soft’-supramolecular interactions in solution are also much larger (of the order of few tens to hundreds of nanometers in diameter) and show soft-matter properties (like scattering, shear under soft forces, etc.) and are proposed to be called ‘soft’ oxometalates. [2] Few case studies of such soft-oxometalates will be shown and discussed in detail. For instance, using ultralow concentration an interesting phenomenonlogy has been recently observed where simple phosphomolybdate Keggin type oxometalates show spontaneous and intriguing structure formation, like those of peapods. [3] In solution at ultralow concentration with a rather large metal oxide based (molecular) system another interesting dynamic of defect structure formation unfolds. [4] However for the purpose of application an ability to direct structure formation in mesoscopic length scales, is needed. This problem can be circumvented by a method of ‘colloidal casting’. [5,6] All these aspects will be discussed with relevant examples to demonstrate structure formation and dynamics and applications with oxometalates in mesoscopic regime [7-9]. The potential application of these systems in micro-optomechanics will also be discussed.

References:

[1] (a) M. Pope, Heteropoly and Isopoly Oxometalates; Springer: Berlin, 1983;

(b) C. L. Hill, Ed. Chem. ReV. Thematic Issue on Polyoxometalates 1998, 98;

[2] S. Roy, Comments Inorg. Chem. 2011, 32, 113. S. Roy, CrystEngComm 2014, 16, 4667.

[3] S. Roy, M. T. Rijneveld-Ockers, J. Groenewold, B. W. M. Kuipers, H. Meeldijk, and

W. K. Kegel, Langmuir 2007, 23, 5292.

[4] (a) S. Roy, K. L. Planken, R. Kim, D. v. d. Mandele, and W. K. Kegel, Inorg.

Chem. 2007, 46, 8469;

(b) S. Roy, K. L. Planken, R. Kim, D. v. d. Mandele, and W. K. Kegel, Inorg.

Chem. 2010, 49, 5775.

[5] S. Roy, M. C. D. Mourad, M. T. Rijneveld-Ockers, Langmuir 2007, 23, 399.

[6] S. Roy, L. Bossers, H. Meeldijk, B. Kuipers, and W. K. Kegel, Langmuir, 2008, 24, 666.

[7] B. Roy, M. Arya, P. Thomas, J. Jürgschat, K. Rao , A. Banerjee, C. M. Reddy, S. Roy, Langmuir, 2013, 29, 14733.

[8] B. Roy, N. Ghosh, P. Panigrahi, A. Banerjee, A. Sahasrabudhe, B. Parasar, S. Roy, J. Mol. Eng. Mater. 2014, 2, 1440006.

[9] A. Sahasrabudhe, S. Roy, . Mol. Eng. Mater. 2014, 2, 1440002.

报告人简介：

1999: BSc. (Honours) University of Calcutta, India

2001: MSc Indian Institute of Technology, Delhi, India

2005: PhD. (summa cum laude) University of Bielefeld, Germany.

2005-2007: Postdoc. fellowship in University of Utrecht, The Netherlands.

2007-2009: Researcher at BASF-ISIS, Strasbourg, France.

2009-2010: Professor, School of Chemistry & Materials Engineering, CIT, Jiangsu, P. R. China. Visiting Professor, CIT, P. R. China, (2010-2014).

2011- : Assistant Professor in DCS, Indian Institute of Science Education & Research

(IISER) Kolkata, India.

Research interest:

Supramolecular chemistry and coordination chemistry of transition metal oxides: Polyoxometalates and Soft Oxometalates.

Selected important References in Coordination Chemistry:

1. "Soft Oxometalates - A very short introduction", S. Roy, Comments Inorg. Chem. 2011, 32, 113.

2. "Soft-oxometalates beyond crystalline polyoxometalates: formation, structure and properties", S. Roy, CrystEngComm 2014, 16, 4667.

3. "Direct evidence on the Existence of [Mo132] type species in Aqueous Solution,"

S. Roy, K. L. Planken, R. Kim, D. Mandele, W. K. Kegel, Inorg. Chem. 2007, 46,

8469.

4. “Synthesis and properties of a novel quarternerized imidazolium [α-PW12O40]3−

salt as a recoverable photo-polymerization catalyst,” D. Chen, A. Sahasrabudhe, P.

Wang, A. Dasgupta, R. Yuan, and S. Roy, Dalton Trans., 2013, 42, 10587.

5. "En route from the mystery of molybdenum blue via the related manipulatable

bulding blocks to aspects of materials science", A. Müller, S. Roy, Coord. Chem.

Rev. 2003, 245, 153.