Table 6 Bond length values of the discussed benzimidazoles

C⁸-C¹⁰

1.506

1.509

1.511

1.506

1.505

1.507

C¹⁰-C¹²

1.528

1.520

1.517

1.517

1.517

1.518

C¹⁰-O¹¹

1.415

1.430

1.426

1.438

1.438

1.427

O¹¹-H²⁰

0.966

0.963

0.961

0.963

0.963

0.961

N⁷-C¹⁴

1.445

1.453

1.447

1.442

1.443

–

C¹⁴-N¹⁵

1.446

1.441

1.458

1.446

1.445

–

N¹⁵-C¹⁶

1.458

1.460

1.429

1.370

1.374

–

C¹⁶-C¹⁷

1.519

1.519

1.397

1.407

1.404

–

C¹⁷-X¹⁸

1.454

1.421

1.385

1.373

1.367

–

X¹⁸-C¹⁹

1.451

–

1.387

1.388

1.396

–

C¹⁹-Y²⁰

–

–

1.386

1.467

1.493

–

N²¹-O²² (NO₂)

–

–

–

1.213

–

–

C-O (COOH)

–

–

–

–

1.354

–

C = O (COOH)

–

–

–

1.196

–

OH (COOH)

–

–

–

0.961

–