STRUCTURE AND THERMAL STABILITY OF THE BENZO-15-CROWN-5 WITH LANTHANUM (III) BROMIDE COMPLEX

Muhammad Idiris Saleh; Eny Kusrini; Abdulssalam Salhin; Rohana Adnan; Ismail Ab. Rahman; Bahruddin Saad; Bohari M. Yamin

doi:10.22146/ijc.21843

STRUCTURE AND THERMAL STABILITY OF THE BENZO-15-CROWN-5 WITH LANTHANUM (III) BROMIDE COMPLEX

https://doi.org/10.22146/ijc.21843

Muhammad Idiris Saleh^(1*), Eny Kusrini⁽²⁾, Abdulssalam Salhin⁽³⁾, Rohana Adnan⁽⁴⁾, Ismail Ab. Rahman⁽⁵⁾, Bahruddin Saad⁽⁶⁾, Bohari M. Yamin⁽⁷⁾

(1) School of Chemical Sciences, Universiti Sains Malaysia, Penang 11800
(2) School of Chemical Sciences, Universiti Sains Malaysia, Penang 11800
(3) School of Chemical Sciences, Universiti Sains Malaysia, Penang 11800
(4) School of Chemical Sciences, Universiti Sains Malaysia, Penang 11800
(5) School of Chemical Sciences, Universiti Sains Malaysia, Penang 11800
(6) School of Chemical Sciences, Universiti Sains Malaysia, Penang 11800
(7) School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor
(*) Corresponding Author

Abstract

The reaction of benzo-15-crown-5 (C₁₄H₂₀O₅) ligand with La(NO₃)₃.7H₂O in the presence of HBr has resulted in the production of an exotic sandwich complex, [LaC₂₈H₃₆Br₄O₁₀][3Br]. The crystal system is triclinic with space group P1, a = 12.5834(14) Å, b = 13.5816(16) Å, c = 13.8403(16) Å, a = 70.751(2)°, b = 66.773(2)° and g = 67.631(2)°. The cation comprises of the lanthanum atom coordinated to two crowns via three oxygen atoms from each crown in a η³-sandwich fashion. The two phenyl groups of the crown are brominated. The La-O_Ligandbond lengths are between 2.857(7) and 2.949(7) Å. The trianion [3Br]^3-is linear with Br-Br bond lengths of 2.518(2) and 2.560(2) Å respectively. The molecule is stabilized by intermolecular interactions of the type C-H^...Br to form dimers and are arranged parallel to bc face.

Keywords

lanthanum; benzo-15-crown-5; hydrogen bonding; bromination; x-ray structure

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DOI: https://doi.org/10.22146/ijc.21843