Naslov
NAFTALDIMINSKA SCHIFFOVA BAZA: SINTEZA I IZOLACIJA TRI POLIMORFA BEZ PRISUSTVA OTAPALA
(NAPHTHALDIMINE TYPE SCHIFF BASE: SOLVENT-FREE SYNTHESIS AND ISOLATION OF THREE POLYMORPHS)

Autori
Cinčić, Dominik ; Brekalo, Ivana ; Kaitner, Branko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
XXII. hrvatski skup kemičara i kemijskih inženjera ; Knjiga sažetaka / Tomašić, Vesna ; Maduna Valkaj, Karolina - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI) ; Hrvatsko kemijsko društvo, 2011, 120-120

ISBN
978-953-6894-42-0

Skup
XXII. hrvatski skup kemičara i kemijskih inženjera

Mjesto i datum
Zagreb, Hrvatska, 13.02.2011. - 16.02.2011

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
organska sinteza bez otapala; polimorfija
(Solvent-free organic synthesis; Polymorphism)

Sažetak
Four crystal forms of the Schiff base derived from 2-hydroxy-1-naphthaldehyde (napht) and 2- aminobenzonitrile (abn) have been prepared by conventional solution-based method [1, 2] and their relationship was investigated by IR spectroscopy, thermal analysis and powder X-ray diffraction. Three polymorphs out of four also have been prepared by solvent-free method [3]. At temperature of 30 to 35 °C, 2-hydroxy-1- naphthaldehyde and 2-aminobenzonitrile react in a liquid eutectic formed by neat grinding providing Form I, while below melting temperature of the eutectic, i.e. 18 to 22 °C, the same materials appear to react without the formation of liquid phase providing Form II. Form III was obtained by neat grinding of reactants and seeding at 20 °C. Single crystal X-ray analysis of all forms revealed conformational differences in the Schiff base molecule and from the molecular geometry consideration the enol-imino tautomer was detected. Polymorphs display interesting and remarkably different molecular packing features via C—H•••N and C—H•••O interactions: 1D chains in Form I, 2D-network in Form III and IV and 3D- network in Form II.

Izvorni jezik
Hrvatski

Znanstvena područja
Kemija

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