STABILIZATION AND MODIFICATION OF POLYCAPROAMIDE - Photochemical Reactions in Heterochain Polymers - page 19

Table 1. Structural forms and characteristics of the derivatives of bis -
aroilenbenzimidazole

Number Compound T of melting

0 C

T of decomposition
0 C

Molecule
weight

Colour

1. XL 385 356 438 yellow

2. XLI 317 335 454 lemon - coloured

3. XLII 315 327 452 light yellow

4. XLIII 307 386 670 yellow

5. XLIV 435 388 538 brightly yellow

6. XLV 335 395 554 lemon - coloured

7. XLVI 295 370 552 light yellow

Biss - (1,8 - naphthoilene - 1,2 - benzimidazole) was synthesized at interaction of bis -
(0 - phenylene diamines) of different structure with naphthalic anhydride according to the
scheme [127]:

Electronic spectra of obtained compounds and presented in Figures 1.1 and 1.2 are
characterized by absorption at λ e max =410-430 nm and luminescence at λ e max =510=530 nm .
Clear peaks of spectra of synthesized compounds luminescence speak about high purity of
obtained products.
Criteria of compounds thermostability were temperatures: of melting, beginning of
compounds decomposition, loss of initial mass by 5, 10 and 25%. These data are given in
Table 2.

Table 2. Thermal characteristics of bis - aroilenbenzimidazoles

T of mass loss 0 C

T of decomposition
beginning, 0 C T of melting, 0 C Compounds

5% 10% 25%

XL
XLI
XLII
XLIII
XLIV
XLV
XLVI

385
317
315
307
435
335
295

356
335
327
386
388
395
370

454
415
409
442
497
440
473

495
473
438
463
545
517
508

562
528
507
480
637
563
605