Supporting Information

Salicylaldimine Copper (II) Complex Catalyst: Pioneer for Ring Opening Polymerization of Lactide

Anita Routaray1, Nibedita Nath1,Tungabidya Maharana2*, Pratap Kumar Sahoo3,Jaya Prakash Das1and Alekha Kumar Sutar1#

1Catalysis Research Lab, Department of Chemistry, Ravenshaw University, Cuttack-3, Odisha, India

2Department of Chemistry, National Institute of Technology, Raipur, India

3School of Physical Sciences, National Institute of Science Education and Research, Bhubaneswar-751005, Odisha, India

Table of contents

  1. FTIR spectra of HMBED Schiff base (Figure S1)
  2. Semilogarithmic plots of L-lactide conversion in time catalyzed by Cu-HMBPD in the presence of BnOH: [L-LA]0 / [Cu]/[BnOH] = 100 / 1/ 1(Figure S2)
  3. Semilogarithmic plots of L-lactide conversion in time catalyzed by Cu-HMBBD in the presence of BnOH: [L-LA]0 / [Cu]/[BnOH] = 100 / 1/ 1(Figure S3)
  4. FTIR frequencies and electronic transitions of HMBED Schiff base and its copper complex(Table S1)
  5. Crystal data of HMBED and structure refinement parameters (Table S2)

Figure S1.FTIR spectra of HMBED Schiff base

Figure S2. Semilogarithmic plots of L-lactide conversion in time catalyzed by Cu-HMBPD in the presence of BnOH: [L-LA]0 / [Cu]/[BnOH] = 100 / 1/ 1

Figure S3. Semilogarithmic plots of L-lactide conversion in time catalyzed by Cu-HMBBD in the presence of BnOH: [L-LA]0 / [Cu]/[BnOH] = 100 / 1/ 1

Table S1.FTIR frequencies and electronic transitions of HMBED Schiff base and its copper complex

Compounds / Absorption frequencies / cm-1 / Frequencies λmax / nm
C=N / C-O / OH / M-O / M-N /  / n / CT / dd
HMBED / 1613 / 1256 / 2800-3000 / - / - / 264 / 330 / - / -
Cu-HMBED / 1630 / 1246 / - / 566 / 442 / 254 / 269 / 322 / 383
Table S2. Crystal data of HMBED and structure refinement parameters[CCDC1409890]
emp. form. / C18H20N2O4 / µ(Mo Kα)[mm-1] / 0.092
form. wt / 329.37 / F(000) / 350
temp [K] / 296(2) / Absolute structure parameter / -0.4(5)
 [Å] / 0.71073 /  range (deg) / 2.170 to 28.768
crystal system / monoclinic / Index ranges / -12<=h<=12,
-8<=k<=8,
-19<=l<=19
space group / P c / Reflections collected / 13590
a [Å] / 9.3994(3) / Independent reflections / 4247
b [Å] / 6.2465(2) / R(int) / 0.0299
c [Å] / 14.4218(5) / Completeness to  = 25.242° / 99.9 %
α (deg) / 90 / Refinement method / Full-matrix least-squares on F2
β (deg) / 93.225(2) / GOF / 1.016
 (deg) / 90 / Final R indices [I>2(I)] / R1 = 0.0372, wR2 = 0.0833
V[Å3] / 845.41(5) / R indices / R1 = 0.0549, wR2 = 0.0914
Z / 2 / Extinction coefficient / n/a
 [mg / m3] / 1.294 / min - max [e.Å-3] / 0.104 and -0.124