CrysTallograPhy in soUTh-easTern eUroPe
the Inst. of Chem.: B. Šoptrajanov, V. Jordanovska, V. Petruševski, S. Aleksovska, V. Stefov, Gj. Petruševski and T. Runčevski. When the country was part of SFR Yugoslavia, Jovanovski
attended the annual meetings of the Yugoslav Centre of Crystal- lography, and organized the 1981 meeting in Skopje. Since 1996, Jovanovski has participated in the annual Croatian-Slovenian crys- tallographic meetings, together with other Macedonian crystal- lographers (S. Pocev, V. Jordanovska, A. Mirčeva, O. Grupče, P. Naumov and P. Makreski). Recently, a Division of Crystallography was established as part of the Society of Chemists and Technolo- gists of Macedonia. None of the national or private universities in Macedonia has
modern crystallographic equipment. Active Macedonian crystal- lographers have conducted research in foreign universities, or in collaboration with such institutions. P. Naumov and P. Makreski, who were mentored by Jova- novski, are currently active in the field. Te main studies underway in Macedonia con- cern chemical crystallography (especially, metal-coordination compounds as models for bio- logical effects of food addi- tives), inorganic compounds (spectra-structural correlations in isomorphous and isotypic series), organic compounds with interesting electronic and optical properties, solid-state reactivity (photochromism and thermochromism), and polymorphism of pharmaceuticals. An Atlas of Minerals from the Republic of Macedonia, is to be published soon (in English) by the Macedonian Academy of Sciences and Arts. One of the most active research groups of the Division of Crys-
Genuine crystals of the mineral lorandite (TlAsS2
) from Alšar, Macedonia.
tallography in Skopje (G. Jovanovski, O. Grupče and P. Naumov) has over 40 publications in international journals, which are mainly related to the coordination chemistry of saccharin (an artificial sweetener with suspected carcinogenic activity), thiosaccharin and their mixed complexes with aromatic bases. In 2004 P. Naumov earned a PhD degree in diffraction at the Tokyo Inst. of Technology,
under the supervision of Y. Ohashi. He established a laboratory for the study of photoinduced phenomena and solid-state chemistry at the National Inst. for Materials Science in Japan (2004-2007), and now leads a research group at Osaka U. (Japan). In 2009 Naumov was appointed associate professor of the Inst. of Chemistry in Sko- pje, where he has been spearheading the devel- opment of collaborative crystallographic research in Macedonia. Te cur- rent interests of the group are materials exhibiting photoinduced and ther- mal phase transitions for (opto)spintronics) appli- cations, X-ray photodif- fraction and time-resolved diffraction using synchro- tron X-rays. Macedonian crystallographers P. Naumov and G. Jovanovski,
after photochemical conversion to pararealgar (b) (J. Am. Chem. Soc. 132 (2010), 11398―11401). Copyright: American Chemical Society.
Crystals of the genuine Macedonian mineral real- gar (As4
S4 ) before exposure to visible light (a) and
together with B. Kaitner (Zagreb), D.A. Rae (Canberra) and S.W. Ng (Kuala Lumpur), determined the crystal structure of the sweet- ener sodium saccharinate, Na64
cial compound incorrectly assumed to have been a dihydrate. Tis extremely complicated modulated structure with a unit cell of 15.6 nm3
(C7 H4 NO3 S)64 ·120H2 and Z′ = 16 (Z = 64) was ranked #6 in the World’s database
of small-molecule structures with high Z′ (U. of Durham). Te Macedonia research team has also described the first direct obser- vation of an all-solid autocatalytic reaction set, a group of photo- triggered reactions proceeding in the crystals of the natural mineral realgar (J. Am. Chem. Soc. 132 (2010), 11398–11401). Ways and means of upgrading crystallographic instruments in Macedonia, are being sought and the advice and assistance of the international community would be greatly appreciated.
index To adverTisers Sodium saccharinate, NaC7
(x = 2), has been extensively used as a food additive and has constituted the basic component of the diabetics’ diet for about 125 years. This crystal structure, with Z′= 16 and a very large unit cell, represents one of the most difficult cases for a small molecular species such as the saccharinate ion. The composition is best described as Na64
H4 NO3 S·xH2 (C7 H4 NO3 S)64 ·120H2 O (Angew. Chem. Int. Ed. 44 (2005), 1251–1254). IUCr Newsletter ♦ Volume 19, Number 2 ♦ 2011 O, listed in most catalogues as a dihydrate
agilenT
www.agilent.com ................................................... 12,13 anTon Paar
www.anton-paar.com ............................................22 brUker axs
www.bruker-axs.com ........................................4,C2 deCTris
www.dectris.com...........................................................20 hUber diffrakTionsTeChnik gmbh
www.xhuber.com............10 inCoaTeC
www.incoatec.com......................................................C4 miTegen
www.mitegen.com......................................................15 moleCUlar dimensions lTd
www.moleculardimensions.com........17 oxford CryosysTems
www.OxfordCryosystems.co.uk ............... 6 PanalyTiCal
www.panalytical.com............................................. 4 rayonix, llC
www.rayonix.com ..............................................25 rigakU
www.rigaku.com ............................................................C3 sToe
www.stoe.com....................................................................18
21 O, a commer-
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